Photophysics of infrared multiphoton excitation in thiophosgene

Journal Article · Sat Jan 01 04:00:00 EST 1983 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.444536· OSTI ID:6640289

Brenner, D M; Spencer, M N; Steinfeld, J I

IR multiphoton absorption (IRMPA) in thiophosgene has been studied by IR-visible double resonance. In particular, the probability of absorption has been measured in both collision-free (molecular beam) and collision-perturbed environments by monitoring the depopulation of the ground state level (000000). Although no evidence for true multiphoton absorption is found, a number of important observations have been made. (1) No correlation exists between the IRMPA spectrum under collision-free conditions and the low energy IR absorption spectrum. (2) Homogeneous depletion of rotational populations occurs at all CO/sub 2/-laser frequencies. (3) Bottlenecks to absorption do not occur in the pumped-mode ladder. (4) The probability of absorption depends inversely on pressure and is affected dramatically by long-range collisions. These results are interpreted in the framework of an optical Bloch equation model.

• Research Organization: Brookhaven National Laboratory, Department of Chemistry, Upton, New York 11973
• OSTI ID: 6640289
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
CARBONIC ACID DERIVATIVES
ENERGY-LEVEL TRANSITIONS
EXCITATION
INFRARED SPECTRA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOSGENE
SPECTRA