Raman pump/probe measurements of state-to-state energy transfer rates in the v = 1 state of H/sub 2/

Journal Article · Mon Aug 15 04:00:00 EDT 1988 · J. Chem. Phys.; (United States)

OSTI ID:7187604

Farrow, R L; Chandler, D W

We have measured state-resolved rotational energy transfer rates of H/sub 2/ (v = 1) in collisions with H/sub 2/ (v = 0) at 295 K, using optical pump/probe techniques. A single rotational level was populated using stimulated Raman pumping, and the degree of collision-induced population transfer was monitored using either coherent anti-Stokes Raman spectroscopy (CARS) or resonance-enhanced multiphoton ionization spectroscopy (REMPI). The CARS and REMPI results are in good agreement; averages of the two sets of rates are 180 +- 27 x 10/sup 6/ s/sup -1/ amagat/sup -1/ for j = 0..-->..2 and 50 +- 8 x 10/sup 6/ s/sup -1/ amagat/sup -1/ for j = 1..-->..3. We also observed transfer of vibrational excitation from paraspin v = 1 states to ortho v = 0 states due to v--v exchange, measuring a rate of 1.9 +- 0.8 x 10/sup 6/ s/sup -1/ amagat/sup -1/ for this process.

• Research Organization: Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550
• OSTI ID: 7187604
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 89:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HYDROGEN
IONIZATION
KINETICS
LASER SPECTROSCOPY
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
MULTI-PHOTON PROCESSES
NONMETALS
PHOTOIONIZATION
RAMAN SPECTROSCOPY
ROTATIONAL STATES
SPECTROSCOPY