Infrared multiphoton decomposition of phosphine sensitized by silicon tetrafluoride

Journal Article · Thu Apr 12 04:00:00 EST 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150652a045· OSTI ID:6510569

Blazejowski, J; Lampe, F W

The decomposition of PH/sub 3/, sensitized by the multiphoton absorption of unfocussed infrared laser radiation by SiF/sub 4/, has been studied in the fluence range of 0.2-0.6 J/cm/sup 2/ and over a total pressure range of 1-16 torr. Absorption of radiation at 1025.3 cm/sup -1/ results in the formation of H/sub 2/ and a solid deposit which is probably composed of polymeric phosphorus hydrides of formula (PH)/sub x/. No significant amount of gaseous phosphorus compounds were detected, although it is possible that trace amounts of P/sub 2/(g) were formed. The effects of initial composition, pressure, fluence, and presence of foreign gases (He, N/sub 2/) on the yields of PH/sub 3/ decomposition and H/sub 2/ formation were examined. A mechanism is proposed which involves absorption of laser energy by SiF/sub 4/, followed by collisional energy transfer to PH/sub 3/ and subsequent unimolecular decomposition of PH/sub 3/ to PH and H/sub 2/. The mechanism is shown to be in reasonable accord with the experimental data.

• Research Organization: Pennsylvania State Univ., University Park
• DOE Contract Number: AC02-76ER03416
• OSTI ID: 6510569
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:8; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080106* -- Hydrogen-- Production-- Biosynthesis & Photochemical Processes
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
CHEMISTRY
DATA
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
INFORMATION
INFRARED RADIATION
KINETICS
NUMERICAL DATA
PHOSPHORUS COMPOUNDS
PHOSPHORUS HYDRIDES
PHOTOCHEMISTRY
RADIATIONS
REACTION KINETICS
SILICON COMPOUNDS
SILICON FLUORIDES