Energy partitioning in elementary gas phase reactions

Technical Report · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5388061

Bersohn, R

During the last 2{1/2} years we: Measured the LIF excitation spectrum of H atoms dissociated by 193 nm light from cyclopentadiene and indene as well as the rate of dissociation of indene. A general relation is that the translational temperature of the H atoms and the vibrational temperature of the molecules before dissociation are equal. We measured the H atom channel in the photodissociation of ethylene at 193 nm. The LIF excitation spectrum was measured as well as the quantum yield. Isotope effects were observed and explained by RRKM theory in CH{sub 2}CD{sub 2} and trans-CHDCHD. We studied the photodissociation of hydrogen molecules with two photon excited states of the rare gas atoms, 5p(01/2) of Kr and 6p(01/2) of Xe. A new much stronger source of Lyman alpha light at 121.6 nm enabled the study of processes in which a hydride is photodissociated at 121.6 nm and within the same pulse a second photon excites H atom fluorescence. For the first time the dynamics of photodissociation of methane, water, acetylene and HCl were measured at 121.6 nm. Large isotope effects were seen. In CH{sub 3}D, CH{sub 2}D{sub 2} and CD{sub 3}H the H atoms were twice as likely to dissociate as the D atoms.

• Research Organization: Columbia Univ., New York, NY (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-86ER13492
• OSTI ID: 5388061
• Report Number(s): DOE/ER/13492-13; ON: DE91017783
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACETYLENE
ALKENES
ALKYNES
ARGON
AROMATICS
CHEMICAL REACTIONS
CHEMISTRY
CONDENSED AROMATICS
CYCLOALKENES
CYCLOPENTADIENE
DIENES
DISSOCIATION
DOCUMENT TYPES
ELEMENTS
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
INDENE
KRYPTON
LYMAN LINES
MOLECULES
NONMETALS
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
POLYENES
PROGRESS REPORT
RARE GASES