Diode laser probing of the low frequency vibrational modes of baths of CO sub 2 and N sub 2 O excited by relaxation of highly excited NO sub 2
Journal Article
·
· Journal of Chemical Physics; (USA)
- Department of Chemistry, Columbia University, New York, NY (USA) Columbia Radiation Laboratory, Columbia University, New York, NY (USA)
Quenching of highly excited vibrational states of NO{sub 2} in baths of CO{sub 2} and N{sub 2}O has been investigated. Dilute NO{sub 2} mixtures were excited by a pulse from an excimer pumped dye laser operating at 495 nm. Various vibrational modes of the bath gases were probed with continuous wave IR diode lasers. Less than 20% of the energy initially placed in the NO{sub 2} by the dye laser is taken up by the vibrational degrees of freedom of the CO{sub 2} or N{sub 2}O baths. For N{sub 2}O, the three different vibrational modes ({nu}{sub 1}=1285 cm{sup {minus}1}, {nu}{sub 2}=589 cm{sup {minus}1}, {nu}{sub 3}=2223 cm{sup {minus}1}) take up almost equal amounts of energy from NO{sub 2}, but the number of vibrational quanta produced in the bath is found to increase with decreasing vibrational frequency. Similar results are found for CO{sub 2} except that the {nu}{sub 1} and {nu}{sub 2} modes cannot be studied separately for this bath gas due to rapid {nu}{sub 1}{leftrightarrow}{nu}{sub 2} intermode equilibration.
- DOE Contract Number:
- FG02-88ER13937
- OSTI ID:
- 5989578
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:12; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diode laser probing of the high-frequency vibrational modes of baths of CO sub 2 , N sub 2 O, and CO excited by relaxation of highly excited NO sub 2
Relaxation of molecules with chemically significant amounts of energy: Vibrational, rotational, and translation energy recoil of an N sub 2 O bath due to collisions with NO sub 2 (E = 63. 5 kcal/mol)
Energy dependence of the relaxation of highly excited NO sub 2 donors under single collision conditions: Vibrational and rotational state dependence and translational recoil of CO sub 2 quencher molecules
Journal Article
·
Tue Oct 31 23:00:00 EST 1989
· Journal of Chemical Physics; (USA)
·
OSTI ID:5249826
Relaxation of molecules with chemically significant amounts of energy: Vibrational, rotational, and translation energy recoil of an N sub 2 O bath due to collisions with NO sub 2 (E = 63. 5 kcal/mol)
Journal Article
·
Thu Sep 05 00:00:00 EDT 1991
· Journal of Physical Chemistry; (United States)
·
OSTI ID:5204034
Energy dependence of the relaxation of highly excited NO sub 2 donors under single collision conditions: Vibrational and rotational state dependence and translational recoil of CO sub 2 quencher molecules
Journal Article
·
Mon Oct 15 00:00:00 EDT 1990
· Journal of Chemical Physics; (USA)
·
OSTI ID:6356064
Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
DE-EXCITATION
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INFRARED SPECTRA
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NITROUS OXIDE
OXIDES
OXYGEN COMPOUNDS
RADIATIONLESS DECAY
RELAXATION
SPECTRA
VIBRATIONAL STATES
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
DE-EXCITATION
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INFRARED SPECTRA
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NITROUS OXIDE
OXIDES
OXYGEN COMPOUNDS
RADIATIONLESS DECAY
RELAXATION
SPECTRA
VIBRATIONAL STATES