Excimer laser photolysis studies of translational-to-vibrational energy transfer in collisions of H and D atoms with CO

Journal Article · Fri Apr 15 04:00:00 EST 1983 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.445397· OSTI ID:6247726

Wight, C A; Leone, S R

Translational-to-vibrational excitation of carbon monoxide is observed as a result of collisions of high energy H and D atoms with CO. The fast atoms are produced by excimer laser photolysis of H/sub 2/S, D/sub 2/,S, HCl, HBr, or HI at 193 or 248 nm. Detection of time and wavelength-resolved infrared fluorescence is used to quantify the CO vibrational state excitation. The CO (v = 1-6) state distribution from H (H/sub 2/S, 193 nm, E/sub cm/ = 2.3 eV) +CO collisons is 0.74 +- 0.15, 0.15 +- 0.01, 0.08 +- 0.01, 0.01 +- 0.01, 0.02 +- 0.01, and 0.01 +- 0.01. The corresponding state distribution from D (D/sub 2/S, 193 nm, E/sub cm/ = 2.2 eV)+CO is 0.79 +- 0.19, 0.13 +- 0.01, 0.05 +- 0.02, 0.02 +- 0.02, 0.01 +- 0.01, and 0.01 +- 0.01. Rotational excitation is at least as significant as vibrational excitation, based on estimates of the total energy transfer. Measurements of the relative vibrational excitation efficiency as a function of initial H atom energy show that the fraction of translational energy converted to CO vibration increases by more than 300% as the initial H atom energy is increased from 1.0 to 3.2 eV. Good qualitative agreement is found between the experimental results and classical trajectory calculations carried out for collinear collisions of H and D atoms with CO using a simple repulsive interaction potential.

• Research Organization: Joint Institute for Laboratory Astrophysics, National Bureau of Standards and University of Colorado
• OSTI ID: 6247726
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:8; 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
ATOMS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
DEUTERIUM
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
HALOGEN COMPOUNDS
HYDRIODIC ACID
HYDROBROMIC ACID
HYDROCHLORIC ACID
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
HYDROGEN SULFIDES
INORGANIC ACIDS
IODINE COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
STABLE ISOTOPES
SULFIDES
SULFUR COMPOUNDS
VIBRATIONAL STATES