Atmospheric Chemistry
description
Transcript of Atmospheric Chemistry
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Atmospheric Chemistry
Michelle FosterDepartment of Chemistry
UMass Boston
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5.0m
200nm
5.0m
200nm
Atomic Atomic Force Force MicroscopyMicroscopy
Single Crystal
Powder
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Sample Cell for Spectroscopic Studies
to Vacuum Line
IR Window
1 cm
Insulating Substrate
Cooling Bath Coil
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Infrared Spectra of the Different Phases of Water
4000 3800 3600 3400 3200 3000 2800
solid
liquid
vapor
Abs
orba
nce
Wavenumber (cm-1)
FLATVAP_B downingwater_B WarrenIce_C
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Water Thin Films
½ layer
1 ½ layers
3 layers
Magnesium Oxide Sodium Chloride
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Uptake and reaction of gases in liquids
Liquid
Gas Phase
Gas phase diffusion
Bounce off
UptakeDiffusion into bulk
Reaction at interface
Products
Products
Evaporation
Reaction
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Undergraduate Researchers:
Kurt van Vloten T.J. Jayasundera Mark D’Agostino Tom DoyleDevon Passno Jennifer Rudberg Sara Yazdi Melinda Furse
Funding:
The Research CorporationPRF-ACSCAS - UMBDepartment of Chemistry
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Water Thin Films on Magnesium Oxide
4000 3800 3600 3400 3200 3000 2800 2600
0.005
T = 20oC
Abs
orba
nce
Wavenumber (cm-1)
17 Torr - 5.8 ML 15 Torr - 3.6 ML 11 Torr - 2.5 ML 5 Torr - 1.9 ML 1 Torr - 1.2 ML .1 Torr - 0.7 ML
0 2 4 6 8 10 12 14 16 18 20 22
0
1
2
3
4
5
6
25oC
(H
2O /
sur
face
ato
m)
Pressure (Torr)
adsorption desorption