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Research in the Kidwell Group
Office: ISC 1287; Lab: ISC 1243; Email: [email protected]
Laser-Based Techniques to Explore Atmospheric Chemical Reactions
9/21/2017 1
Kidwell Group Fall 2017
College of William and Mary, Kidwell Group Research Description
9/21/2017 2
The Laser Lab
College of William and Mary, Kidwell Group Research Description
Aerosol Formation
College of William and Mary, Kidwell Group Research Description 3
[IPCC, 2013]Kulmala, M., Science, 2003, 302, 1000
College of William and Mary, Kidwell Group Research Description 4
Atmospheric Chemistry in the Kidwell Research Group
Marine Chemistry Planetary Atmospheres
All three projects are
investigating the first
few nucleation events
towards aerosol
formation under
different conditions
Urban Tropospheric Chemistry
College of William and Mary, Kidwell Group Research Description 5
Our Experimental Tool Kit
Sample/ArPump
Laser
Probe
Laser Townsend et al., Rev. Sci. Instrum. 2003 74, 2530
Eppink et al., Rev. Sci. Instrum. 1997 68, 2477
College of William and Mary, Kidwell Group Research Description 6
Anthropogenic Emissions in Urban Tropospheres
Lin, P., Phys. Chem. Chem. Phys., 2015, 17, 23312
Brown Carbon Molecules
Many classes of BrC molecules with many isomers
Fossil Fuels
Biofuels/Biomass Burning
College of William and Mary, Kidwell Group Research Description 7
Near UV Photodissociation of NitrophenolsE
ner
gy
Ground
State
Excited
State
355
nm
Pu
mp
Reaction Coordinate
NO
UV
Pro
be
Probing NO Q1(30.5)o-Nitrophenol + hn → Hydroxyphenoxy + NO
College of William and Mary, Kidwell Group Research Description 8
Biogenic Emissions from Oceans/Bodies of Water
Biomaterial
Halocarbons,
Amino Acids
Sulfur
Compounds
Bimolecular
Reaction
+hν+H2O,
NH3, etc.
Phytoplankton
Solar
Photolysis
College of William and Mary, Kidwell Group Research Description 9
Ozone Depletion from Halocarbon Photochemistry
CH2BrI + hn → CH2Br + I/I*
College of William and Mary, Kidwell Group Research Description 10
Ozone Depletion from Halocarbon Photochemistry
CH2BrI + hn → CH2Br + I/I*Probing I Probing I*
College of William and Mary, Kidwell Group Research Description 11
Ozone Depletion from Halocarbon Photochemistry
CH2BrI + hn → CH2Br + I/I*Determination of the
Bond Dissociation Energy (D0)
College of William and Mary, Kidwell Group Research Description 13
Planetary Atmospheres: Cassini’s Grand Finale Sept. 15, 2017
nasa.gov
College of William and Mary, Kidwell Group Research Description 14
Planetary Atmospheres: Models for Earth’s Atmosphere
College of William and Mary, Kidwell Group Research Description 15
Student Research Activities & Involvement
En
erg
y
S0
S1
35
5 n
m
Reaction Coordinate
UV
Probe
355 nm
Pump
Students will learn:
• Instrumentation building, troubleshooting
• Operate lasers and equipment to run experiments
• Computational chemistry and modeling
College of William and Mary, Kidwell Group Research Description 16
Kidwell Group
Currently 11 Students in the Group
• 1 Graduate Student: Jacob Blackshaw
• 6 Seniors: Annalise Ajmani, Changen Pan,
Wade Fritzeen, Sam Zhang,
Joseph Lee, Chandan Reddy
• 1 Junior: Robert Korb
• 2 Sophomores: Naa-Kwarley Quartey,
Sarah Chen
• 1 High School Student: Lehman Montgomery
• Interested in taking Freshmen,
Sophomores, or Juniors