Diode laser probe of CO/sub 2/ vibrational excitation produced by collisions with hot deuterium atoms from the 193 nm excimer laser photolysis D/sub 2/S

Journal Article · Wed Jan 01 04:00:00 EST 1986 · J. Chem. Phys.; (United States)

OSTI ID:6199501

O'Neill, J A; Cai, J Y; Flynn, G W; Weston, Jr, R E

The 193 nm excimer laser photolysis of D/sub 2/S in D/sub 2/S/CO/sub 2/ mixtures produces fast deuterium atoms (E/sub TR/approx.2.2 eV) which vibrationally excite CO/sub 2/ molecules via inelastic translation--vibration/rotation (T--V/R) energy exchange processes. A high resolution (10/sup -3/ cm/sup -1/) cw diode laser probe was used to monitor the excitation of ..nu../sub 3/ (antisymmetric stretch) and ..nu../sub 2/ (bend) vibrations in CO/sub 2/. The present results are compared with previous experiments involving hot hydrogen atom excitation of CO/sub 2/ in H/sub 2/S/CO/sub 2/ mixtures as well as with theoretical calculations of the excitation probability. The probability for excitation of a ..nu../sub 3/ quantum in CO/sub 2/ is about 1%--2% per gas kinetic D/CO/sub 2/ collision. Bending (..nu../sub 2/) quanta are produced about eight times more efficiently than antisymmetric stretching (..nu../sub 3/) quanta. The thermalization rate for cooling hot D atoms below the threshold for production of a ..nu../sub 3/ vibrational quantum corresponds to less than 2 D*/D/sub 2/S collisions or 15 D*/CO/sub 2/ collisions.

• Research Organization: Department of Chemistry and Columbia Radiation Laboratory, Columbia University, New York, New York 10027
• DOE Contract Number: AC02-78ER04940
• OSTI ID: 6199501
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 84:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
DEUTERIUM
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
HYDROGEN SULFIDES
ISOTOPES
LASER SPECTROSCOPY
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
SPECTROSCOPY
STABLE ISOTOPES
SULFIDES
SULFUR COMPOUNDS
VIBRATIONAL STATES