Gl

The ~3+ 2'2 band of ozone :

line positions and intensities

S. BOUAZZA. A.BARBE and J.J. PLATEAUX

Université de Reims I URA 1434

UFR Sciences 51062 Reims Cedex France

High resolution infrared spectra of 03 have been

recorded with a F.T. spectrometer at Reims University with a

Resolution of 0.006 cm-1. The 4350 cm-1 region corresponding to

the 3'3+ band has been analysed for the first time:

absorpt i on i s very weak i n th i s regi on, so we recorded the

spectra with a white-type multtpath cell 50 Torr 36 m ]

least squares fits, particulary suitable for 03 crowded spectra

resulted in values for intensities and positions of almost 150

lines.

The observed wavenumbers and intensitles are compared with

those computed through the Watson's type Hamiltonian.

G2

CALCULA TIONS OF N2-' 02-, AND AIR- BROADENED

LlNEWIDTHS OF OZONE

L. Rosenmann

Laboratoire E.M.2.C du CNRS et de I'ECP, Ecole Centrale Paris, Grande Voie des

Vignes.92295 Châtenay-Malabry Cedex. France.

C. Camy-Peyret and J.M. Aaud

Laboratoire de Physique Moléculaire et Applications, Université Pierre et Marie Curie

et CNRS. 4 Place Jussieu. 75252 Paris Cedex 05. France.

R.R. Gamache

The Center for Atmospheric Research, University of Massachusens Lowel1, 450

Aiken Street, Lowel1. Massachusens 01854. USA.

A theoretica1 model which provides a correct treatment of close collisions has

been recently applied to 03 line broadening (1). The ca1culations were in good

agreement with measurements of N2- and <>2- broadened linewidths in the Vt+V3

band at room temperature. We present here comparisons between theoretical

predictions and measurements of N2-. <>2-, and air- broadening coefficients of 03

covering a wide range of rotational quantum numbers in different vibrational bands.

The temperature dependence of broadening coefficients is also investigated

1. S. Bouazza. A. Barbe, 1.1.Plateaux, L. Rosenmann. J.M. Hanmann. C.

Camy-Peyret. J.M. Aaud, and R.R. Gamache. submitted to J. Mol. Spectr.

G3

DETECTION OF ATMOSPHERIC TRACE CONSTITUENTS USINGFAR INFRARED SYNTHETIC SPECTRA

B REBOURS P. RABACHE

Laboraloirc dc Géopbysiquc Exlcrnc DPAM

UnivcrsÍlé dc Rcnncs, BP 150 22302 Lannion, Francc

Tbc ncwcsl rcsuhs on our synlbclic infrarcd speclra will bc rcporlcd.

A compulcr program laking inlo accounllbc effccls of rbc 30 slralospbcricconsrilucnls bas bccn uscd. Almospbcric speclra of Ibc following conslilucnlsbavc bccn mainly analyscd H202, H02 ,HB, ' S02 belwccn 10 -170cm-1.

From Ibc bigb rcsolulion speclrum, Ibc dClcclion of slralospbcric IraccconslÍlucnls bas becn sludicd undcr obscrvalion condilions of rbc middlc

slralospbcrc.

G4

Measurement of Pressure Broadening and Shift in the COFundamental Band by a stabilized IR-Diode Laser

Spectrometer

N. Anselm, T. Giesen, R. Schieder, G. Winnewisser, and K.M.T. Yamada

1. PhysikaJisches Institut, Universitãt zu KöJn,D-5000 [(öJn 41, Germany

The knowledge of pressure broadening and pressure shift of molecular linesof trace gases in our atmosphere such as CO, H20, etc. are essential to obtain arealistic picture of the structure and dynamical processes in the atmosphere outof spectroscopic observations.Using a stabilized, high-resolution IR-Diode Laser Spectrometer (1,2) with ashock isolated cold head, foreign gas effects due to Ar and N2 of rovibrationaltransitions of CO fundamental band were measured in the present study. HighJ R-branch transitions as well as low J transitions in the R- and P-branch have

been examined with high accuracy.To increase the S/N ratio of the measurements a 50m multiple reßection cel1 ofHerriott type was used. The accuracy of the lineshiCt and broadening measure-ments in the present study is 0.01 MHz/mbar.

(1) M. Reich, R. Schieder,H.-J. Clar, and G. WinnewisserAppl. Opt. 25, 130 (1986)

(2) H.-J. Clar, R. Schieder, M. Reich, and G. Winnewisser,Appl. Opt. 28, 1648-1656 (1989)

This work was in part support.ed by the Deutsche Forschungsgemeinschaft (SFB 301)

G5

The Far Infrared Spectrum of Ozone: Line

Positions and Line Strengths

Georg Wagner and Manfred Birk

Deutsche Forschungsanstalt für Luft- und Raumfahrt,

Jnstitut für Optoelektronik,

Münchener Straße 20, 8031 Oberpfaffenhofen, B.R.D.

The far infrared spectrum of ozone from 25 to 200cm-1 has been mea-

sured with a Bruker IFS120HR Fourier transform infrared spectrometer at an

unapodized spectral resolution of 0.004 cm-I. Absolute line strengths for the

pure rotational transitions have been obtained for the first time. Special care

has been taken to determine the partial pressure of ozone; the corresponding

procedure wi\l be discussed.

The line strengths and positions were determined with the INTBAT pro-

gram packagel performing a line-by-line nonlinear least squares fit to the

experimental line profiles. The line positions were analyzed with an asym-

metric top Hamiltonian (Watson A-reduction). The current state of the line

strength analysis wi\l be presented and compared with recently published

values based on theoretical calculations by Flaud et al.2

'Developed by J. W. C. Johns, NRC, and improved in c:ollaboration with our group.2J._M. Flaud, C. Camy-Peyret, C. P. Rinsland, M. A. H. Smith and V. Malathy Devi,

Atlas oí Ozone Spedral Parameters from Microwave to Medium Inírared, Academic Press,

Inc., San Diego 1990

G6

Pressure Broadening Coetrlcients in tbe J'2-Band of H2S measuredby TDLAS

J. Waschull, Ka. Hemnann, B. Sumpf, V. V. Pustogov, F. Kühnemann

Abteilung für MolekülphysiklPhotobiophysik der Humboldt-Universitãt zuBerlin,

Fachbereich Physik, Invalidenstr.llO, 0-1040 Berlin, Germany

We present experimental resuIts on the pressure broadening of absorption

lines in the I'rband of H2S obtained by means of a pulsed driven diode laserspectrometer. For the first time we give details about the quantum numberdependence of broadening coefficients for that gas. We investigate self- andforeign-broadening to obtain data for the modelling of pressure dependenceof H2S spectra. It is our aim to find out the minimum detectableconcentrations of H2S (e.g. in exhaust gases of catalyst equiped motorvehicles) which could be measured with high resolution infrared methods.

12.01 TOIT

6.06 TOJT

2.07 TOJT

LOO TOJT

1234.52 1234.56 1234.60

SeltbroadeDiq of H2S

1234.64an-1

G7

ROTATIONAL RELAXATION MATRIX STUDY

VIA LINE SHAPES IN THE ROTATION-VIBRATION IR BANDS

N.N. FILlPPOV, M.V. TONKOV

Institute of Physics, St.-Petersburg University,

Peterhof, St.-Petersburg, 198904, RUSSIA

The line mixing effect on line shapes in the IR absorption spectra of gaseous COand CÛ2 has been studied in the impact approximation. The theory. which tteats the

molecular rotational motion classically has been used and the method of transformation

of the relaxation transition distribution into discret form has been proposed. The

rotational relaxation matrices found in this semiclassical approximation have been

applied to the line shape calculation. The vibration-rotation parallel band shapes in theexperimental spectra of CÛ2 and CO mixed with rare gases have been analysed to find

rotation31 relaxatio!1matrices. These matrices are compared with computed ones with the

aid of the hard collision model using the ab initio potential. The comparison with the

results of the quantum calculation is also presented. The accordance is good for the light

penurbing particles. For heavier atoms (Ar, Xe) the attractive forces seem to be

considered. .

G8

The Temperature Dependence of the Pressure Broaden1ng

Parameter for the J = 6 ~ 7 Line of (CH313CCNmixedwith OCS.

J.Galica. S Gi~rßz~] E.Mi~-Kuzmiñßka

In$titute of Molecular Phyelce.

Polleh Academy of Sclencee.

P.:.znañ. P.:.land

The t.eIDperature dependence of l1new1dth parameter for

J=6~7 l1ne of pivalonitrile at 38 .198.8 11Hz mixed w1th

OCS has been studied ",xper1mentally from 250 to 300K.

The dependence of 11newidth parameter r./(>uld be

deecribed by the empirical relations ~v/p ~ TH.

This value x and the valuesof linewidthparameterswas

COIDP81'ed 111th the values calculated accordin8 to

Murphy-Boggs theory.The measurements have been made w1th the convent1onal

t.;1'~rollave Stark ::;pectl'orneter.

G9

He-broadened HaJf-Widths of PH3

Carlos B. Suårez

Programa Quinor, CONICET, C.C. 962, 1900 I.A PI.ATA,ARGENTlNA

P~ absorbs in the 5 and 8 ~m window regi~ns of the atmospheres of Jupiter

and Satum. The spectra were obtained by means of a high-resolution Fourier

Transform spectrometer and absorption cells of 2, 5 and 57 mm in length and

different pressure conditions.

Using a nonlinear least-squares technique we obtained broadening coeffi-

cients for the case of PH3 + He at room temperaturð, and down to 140 K

Together with previous studies of self-broadening we have centered our

attention in the 2000-2500 cm.1 region, where bands overlap. Low tempera-

tures provide spectra which imitate actual planetary conditions, eliminating

high J lines and simplifying them.

e-mailaddress:atinalquinorlsuarezorsuarez@quinor.edu.ar

GlO

Infrared Wavenumber Standards from FTS Measurements--------------

Jean Col1et,Guy Guelachvili, Qingli Kou, K. Narahari Rao*.Laboratoue de Physique Moléculaire et Applications

CNRS. Université de Paris Sud. BâL 350.91405 Orsay-CEDEXFRANCE

* Depanrnent of Physics. The Ohio State University.Columbus. 43210 Ohio

USA---------------

Secondary wavenumber standards covering a continuous range between 1250 and 6700

cm'( are established from molecular absorption speCtra recorded with a Fourier transform

interferometer. They complete and extend the previous Handbook of Infrared Standards (1).

The selection of molecular spectra up to about 7000 cm'( made in the course of the present

work [2. 3) is partly intended to help the joint effon of an internationa1 group of spectroscopists

which are engaged in a project sponsored by IUPAC for the establishment of unified

wavenumber standards. The present work is also intended for the provision of appropriate data

useful for dayly work in the research lab and/or in the production unit. A general presentation

of the spectroscopica1ly assigned spectra and of their processing is given.

The .support 01 "Bureau National de M~trologie" under Contract 90-2-46-0022 isacknowledged

References:[11 G. Guelachvili. K. Narahari Rao. Handbook of Infrared Standards. (With Spectral

Maps and Transition Assignments between 3 and 2600 j.1m).Orlando: Academic Press, Inc.,1986.

(2) Q. Kou. "Métrologie de Fréquence par Spectroscopie de Fourier. Etude etAmélioration des Performances Actuelles",Thèse de Doctorat, Université de Paris 6. Juin 1991

. (3) G. Guelachvili. K. Narahari Rao. To be published. Handbook of Infrared Standards.Orlando: AcadeßÙcPress.lnc..( about 1000pages) 1992.

Gl1

The JPL Submillimeter, MilIimeter, and Microwave Spectral Line Catalog

H. M. Pickett and R. L. Poynter and E. A. CohenJet Propulsion Laboratory, California Institute of TechnologyPasadena, California 91109, U. S. A.

This report describes a computer accessible catalog of submillimeter, millime-

ter, and microwave spectra1 lines in the frequency range between 0 and 10000

GHz (i.e., wavelengths 10nger than 30 "01). The catalog is intended to be used as

a guide in the planning of spectralline observations and as a reference which can

facilitate identification and analysis of observed spectral lines. The selection of

lines of the catalog is based on the project needs of astronomers and atmospheric

scientists. The information listed for each spectral line inc\udes the Crequency

and its estimated error, the intensity, lower state energy, and quantum number

assignment. The current edition has information on 206 atomic and mo1ecu1ar

species and inc\udes a total oC630924 lines. Forty-three oCthe species are new tothis edition and 31 have been revised.

The catalog has been constructed by using theoretical least squares fits oC

published spectral lines to ac~pted molecular models. 1n some cases the pub-

Jished data have been augmented by additional measurements. The associated

predictions and their estimated errors are based upon the resu1tant fitted param-

eters and their covariances. Future versions oCthis catalog will add more atoms

and molecules and update the present listings as new data appear.

The catalog is available as a magnetic data tape recorded in card images, with

one card image per spectral line, Cromthe National Space Science Data Center

at Goddard Space Flight Center, MD.

Examples oCthe data and documentation wiU be presentcd. The procedures

Coracquiring the most current version oCthe catalog will be shown.

G 12

Mtchelson controlled tunable dtode laser spectrometerSomeappltcattons to ltne parameters study

A. Henry, M. Margotttn-Maclou, F. Rachet, A. Yalenttn andL. Henry

The phase control of a tunable dtode laser (T.D.L.) by aHichelson 1nterferometer 1s very eff1c1ent w1th the new Pbsalts bur1ed heterostructures dopped with europium (1) fromLaser Photontcs Analytics D1v1s10n. One can obtatn high

preciston wavenumber(u) and 1ntensity (lt) on each point ofa spectrum with1n a TDL mode. The path d1fference of theHichelson 1nterferometer is step by step controlled by astab111sed HeNelaser (2). On each step the TDLis locked onthe same interference order by chang1ng 1ts em1ss10nfrequency. W1tha mean path difference of one meter a step of79 nanometer corresponds to a wavenumberchange of 2xl0-4cm-1

at 2000 cm-1 that makes tens of samples (u,It) for the entireprof11e of a Coppleï line. .

Illustrative results will be given in :1') deconvolution of Doppler lines in a Q-branch,

decreasing the linewidth by a 2.5 factor (3)2') linebroadening parameters3') line coupl1ng4') line shift

(1) Z. Fert, D. Kostyk, R.J. Woodsand P. HakJ. Vac. Sci. Technol. 88 200 (1990)

(2) A. Valentin, Ch. N1colas, L. Henry and A.W. HantzAppl. Opt. ~. 41 (1987)

(3) See O.W. Herdes, J. Pliva. A.S. PineJ. Hol.. Spectrosc. !!I. 431 (1991) and referencestherein

G 13

The V8fundamental of l,l,l-trideutero ethane

L.Fusina, G.D.Nivellini, and F.TulliniDipartimento di Chimica Fisica e lnorganica, Universita' di Bologna,

Viale del Risorgimento 4, 40136 Bologna, ltaly

Spectraof 12CH312CD3and 13CH312CD3have been recorded in the region2000-2300cm-1,with a resolution of 0.004cm-1.

In this region the Vs (V~) fundamental band should be observed at

around 2230 cm-1; however in the spectra previously recorded it was notpossible to identify even its band centre(1). This fundamental is certainlyFermi resonance perturbed. In addition to the possibility of Fermi

resonances with all of 2v1~(2 XpOi), 2Vl~(2 XÕ~), and v4 + vlO(Õ~ + p:t'),

we suspect a rotational resonance ~th 2v4 (2 X Õ~) wich appears to bealmost coincident with the perturbed position of v8.The analysis of the spectrum is still in progress.

(1) J.L.Duncan, R.A.Kel1y, G.D.Nivellini and F.Tullini, J. Mo/. Spedrosc. 98, 87-110 (1983)

G 14

THE INFRAREDSPECfRUM OF 13C2H2BELOW4000 CM-l

G. Di Lonardo, P. Ferracuti, L. Fusina, K.A. Mohamed, and E. VenutiDipartimernodi ChimicaFisicae lnorganica,Universira'di Bologna-ltaly

and

J.W.IohnsHerzberg lnstitUle 01 Astrophysics. National Research Council 01 Canada-Ottawa-

Canada

The high resoluûon ( 0.OO2-ü.OO6cm-1 ) infrared spectra of 13C2H2' were

recorded between 50 cm-1 and 4200 cm-1. Besides the V3 ( C-H asymmetric

stretching ) and Vs C cis bending ) fundamental bands, a large number ofcombinaûon bands and hot bands have been analysed. They involve vibraûonallyexcited states of a11the normal modes of the molecule.About 40 excited vibraûonal states have been so far characterised, includingbending states up to v4+vS =4.The spectra contained also absorption bands due to the 12C13CH2molecule, whichhave also been analysed.Work is sûll in progress in order to assign many observed weak bands.

Work pcrformed in thc framc of ECC coopcrañon program SCIENCE,contract No. SCl.-CI91-0711 (TSTS).

G 15

THE 2111BAND OF HOCI

F. CAVAZZA, G. DI LONARDO and L. FUSINA,

Dipartimento di Chimica-Fisica e Inorganica, Viale Risorgimento 4,

40136 Bologna, Italy.

and

J. ORTIGOSO and R. ESCRIBANO

hlRtituto de Estructura de la Materia, C.S.I.C., Serrano 119-123, 28006 Madrid, Spain.

TIR! first overtone of the O-H stretching mode 211Jof HOCI is a hybrid band with

clearly visible ø and b structure. It is centered at 7049.8 cm-I and it coincides on

its high frequency side with the 1.4p water band, which provides a good wavenumber

calibration. The spectrum has been recorded in the 6700-7230 cm-I region at 0.015

cm-I resolution on the Bomem DA3.002 Fourier Transform spectrometer at Bologna.

The total presaure was 20 Torr and the pathlength through the multiple reftection cell

was 6 m. This band had been observed before [1) at low resolution, and a complete

analysis of over 1000 ro-vibrationallines has been carried out for the first time. For the

perpendicular component, mOlt lines in either wing of the spectrum have been assigned,

whereas a few series only have been disentangled from the crowded centra1 region. For

the parallel component. K. = 0,1 series present some perturbation which hinders their

assignment. The latest results of the analysis will be discussed at the meeting.

(1) K. Hedberg and R.M. Badger, J. Chem. Phys. 19508-509 (1951).

r G 16

THEVs AND2vg BANDSOF NITRIC ACID

(LINE POSITIONS)

A. Perr1n V.Jaouen, A.Valent1n,J.-M. Flaud,c. C~-Peyret

Laborato1re de Phys1queHoTécu1a1reet App11cat1ons(I), CNRSUn1vers1té P1erre et Har1e Cur1e

Tour 13, Bte 76, 4 P1ace Juss1eu

75252 PARISCedex 05 (France)

Very recent1y us1ng d10de 1aser techn1que a new analys1s of the Vs and 2vgInteract1ng bands of n1tr1c ac1d 10cated at 11~ has been performed [A.G. Hak1,

and J.S. We11s, J. Ho1. Spectrosc. 152, 69-79 (1992)] . As compared to th1s

recent ana1ys1s, the present work prov1des: (1) a more extended ana1ys1s of the

Vs and 2vg bands of HN03uS1ng a h1gh reso1ut10n (-0.003 cm-1) Four1er transformspectrum recorded In the 830-930 cm-1 spectra1 range, (11) a d1fferent

descr1pt10n of the resonances between energy 1eve1s of the vs-l and vg-2

v1brat1ona1 states of HN031nvo1v1ng ~ Ferm1- and Cor1011s- type operators

and (111) an accurate 11ne11st of the P, Q and R stacks of the Vs and 2vg bandsof nitrlc ac1d.

by M.Badaoui. and G.Tarrago. L.P.M.A.. OrsaY. Francc

L.R.Brown. Jet PropuIsion Laboratory. Pasadena, USA.

G17

LINE POSmONS AND INTENSITIES IN THE TRIAD v2. Vs and 2V3 of CH3Cl(35)

The absorpûon of CH3CI(35) near 7 11m is being reinvesûgated to support

atmospheric remote sensing. The three bands in the region, v2. Vs and 2V3 at 1354.883,

1452.179 and 1456.757 cm-I respectively, are analysed using new spectra recorded at

0.006 cm-I resoluûon with the Kitt Peak inteñerometer.

ln order to model these data accurately, the triad formulation involving Coriolis

coupling v'JJvs and Fenni coupling vsJ2v3 is used. The complete model a1lows us to

extend the line assignments of V2 and Vs far beyond those given by Ref.(I. 2), and to

make for the fust time many identifications of 2V3 lines. especia1ly near the level

crossings with vs.

A cons:stent set of energy p::r:ur.et::~. derived by fitting over 4200 transirlûns. is

presented. The intensity analysis is in progress. Predicted line pararneters of the three

bands will be available for atmospheric applications.

1 - M.Morillon-Chapey, G.Guelachvili and P.Jensen, Can. 1. Phys.62. 247-253 (1984)

2 - N.F.Henfrey and B.A.Thrush, J. Mol. Struct. 146,71-83 (1986).

G 18

ABSTRACT

RJNG-PUCKERJNG AND BUTTERFLY MOTJON JNTERACTION JN JNDOLINE:EVIDENCE FROM THE DOUBLING IN THE ROTATIONAL SPECTRA OFGROUND AND LARGE AMPLITUDE MOTION EXCJTED STATES OF THENORMAL AND N-D MONODEUTERATED SPECIES.

a b cw.CAMINATI. L.FAVERO. B.VELJNO

a - Centro di studio di Spettroscopia a MicroondeDipartimento di Chimica "G.Ciamician"Universita' di Bologna. via Selmi 240126 Bologna, Jtalia.

b - Istituto di Spettroscopia Molecolare del CNRvia Castagnoli 140126 Bologna. Italia.

c - Dipartimento di Chimica Fisica e InorganicaUniversita' di Bologna.via1e Risorgimento 440136 Bologna. Italia.

The rotational spectra of indoline and indoline N-Dhave been observed in the 26-40 GHz range.

Doublings due to the ringring have been observed inand in the first puckeringstates.

puckering of the five memberedthe ground vibrational statesand butterfly motion excited

The interpretation of the vibrational splittings requiresa two-dimensional analysis of the potential energy surface.

The barrier to the inversion appears considerably lowerthan previously reported.

G 19

Ultra-hiqh re801ution ap8ctro8COPY of 28SiF,

Kyperfine-in4uce4 liftinq of parity 48q8neracy

in a 8up8rfine clu8ter.

O. Pf1ster, Ch. Chardonnet and Ch.J. Bordé

Laboratolrede Physlque des Lasers.Unlverslté-ParlsNord, Vllletaneuse,France.

Magnetlc hyperf1ne structures are currently resolved wlth C02 laser sub-Doppler technlques and 28SIF4 Is the thlrd spherical-topmolecule (afterSFaand Os041 whlch Isextenslvely studled with the spectrometer of Vlllet8neuse.Because of the spln zero of 28S1 and the spln '/2 of F, the spln-rotatlon.thespln-vlbratlonand the spln-spln terms are the main contrlbutlons to the

hyperf1ne hamiltonlan Inthe v3 band of 28SIF4'

The appllcetlonof the Paullprlnclplehas several Important consequences :therovlbratlonalst8tes may be only A2' E and F,. representatlons of the polntgroup Td (here. we adopt the notatlons of Landau and BergerC1lI.Moreover.only the E states are doubly degenerate wlth respect to parltyand for thesestates. the total spln of the fluorlne nuclells zero.

For that reason. a w8i1 bolat8d E levelcomprlses two states whlch dlfferonlyby thelrtot81parityand only the very unllkelyInverslon of the molecule or a

parlty vlolatlon could be responslble of a IIftlnqof thls degeneracy. Asexamples, such an effectcould not be observed wlth a resolutlonof 1kHz onthe P(301 E3 and R(491 E2.

However, we observed a IIftlngof parltv dejJeneracy of the E IIne whichbelongs to the superf1ne cluster. RI341 F,Ö(-IEUF,O(+I. The EO IIneIs roughly

in the mlddle of the F,O(-Iand F,O(+llInes (former not8tlon : F20 and F,OIwhlch are separated by 1.6 MHz whereas the E(+ I-E(-)doubllng isof 8 kHz.

We Interpretthlsspllttlngas resultlngfrom the hyperf1ne interactlonswhlch do

not respect the polnt group symmetry of the moleculel21. Actually, the

tensorlalspln-rotatlonand spln-vlbratloncoupllngs mlx. on one han2< the F,O(-)and the EU(-)st8tes and, on the other hand. the F,O(+ 1 and the I:v(+ 1 st8tesand pushes away the two E components one from each other. ThlsInterpretatlonIsfullyconf1rmed by the theoretlcalcalculatlonof the structure.

We emphaslse that the physlcal orlglnof thls IIftlngof parlty degeneracy Isslmilarto the A,u-A' 8doubllngs observed earllerIn superf1ne clustersof SFø,/31but is dlfferentfi m that revealed by the doubllng of the RP2(101 IIneofphosphlne whlch occurs for IsolatedIIne141.

111 H. Berger, J. Physlque (Parlsl38, 1371 (19771.

(21 Ch.J. Bordé, M. Ouhayoun, A. Van Lerberghe, Ch. Salomon. S. Avrllller,C.D. Cantreiland J. Bordé. Laser Spectroscopy IV, Eds : H. Walther and K.W.Rothe. Sprlnger-Veriag. p142 (19791.(3) Ch.J. Bordé, J. Bordé, Ch. Bréant, Ch. Chardonnet. A. Van Lerberghe. andCh. Salomon. Laser Spectroscopy VII, Eds : T.W. Hllnsch and Y.R. Shen,Sprlnger-Verlag,p108 (19851.(41 Ch. Chardonnet, R.J. Butcher and Ch.J.Bordé,accompanled paper.

G 20

H1gh Resolut1on Spectroscopy of (Pentad-Dyad) and COctad-Pentad)

Hot Bands of Methane 1n a Superson1c Jet

G.S.BARONOV, D.K.BRONNIKOV, S.A.GAVRIKOV, I.I.NIKOLAEV,

V.D.RUSANOV, Yu.G.FILIMOV, AND J.C.HILICO