(Picosecond CO/sub 2/ laser interactions with polyatomic molecules): Progress report

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6317951

During the past year, the infrared absorption spectra of molecules in the highly vibrationally excited states were obtained using the picosecond CO/sub 2/ laser system. The spectra were found to depend on the degree of excitation and the probe pulse duration. The intramolecular energy relaxation time can be inferred from this pulse duration dependence effect. This is the only study of this kind ever performed that yield dynamical result from a static spectral measurement with a variable interaction time. A Bloch equation model was used to explain the change in the absorption cross section as a function of the pulse duration at line center. The intensity dependence of the multiphoton excitation process can be explained completely by this calculation. Some initial results were also obtained on the UV-IR double resonance experiment. Using CrO/sub 2/Cl/sub 2/ as the sample, the time resolution of the non-resonant multiphoton ionization signal were obtained. Preliminary analysis shows that the signal decay was due to collisional deactivation of the initial electronic excitation.

• Research Organization: State Univ. of New York, Stony Brook (USA). Research Foundation
• DOE Contract Number: FG02-85ER13405
• OSTI ID: 6317951
• Report Number(s): DOE/ER/13405-T1; ON: DE87012072
• 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
BLOCH EQUATIONS
CARBON DIOXIDE LASERS
DEACTIVATION
ENERGY LEVELS
EQUATIONS
EXCITED STATES
GAS LASERS
INFRARED SPECTRA
IONIZATION
LASERS
MOLECULES
MULTI-PHOTON PROCESSES
PHOTOIONIZATION
POLYATOMIC MOLECULES
RELAXATION TIME
SPECTRA
VIBRATIONAL STATES