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Formation of SiF2 in the infrared multiphoton decomposition of Si2F6 and the reactions of SiF2 with Br2, NO2 and C2H4

✍ Scribed by Ko-ichi Sugawara; Fumiyuki Ito; Taisuke Nakanaga; Harutoshi Takeo

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 444 KB
Volume: 232
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)01384-8

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✦ Synopsis

The infrared multiphoton decomposition of Si2F 6 has been investigated by time-resolved infrared diode laser spectroscopy. Direct formation of SiF2 ()(IA~) in the ground vibrational state and indirect formation via vibrational relaxation were found. Simultaneous formation of SiF4 with SiF2 was also observed, indicating that a 1,2-fluorine shift occurs in preference to Si-Si bond scission. The vibrational relaxation of SiF2 in H2 was found to be about twenty times faster than that in N2 because of resonant vibration-rotation energy transfer. The rate constants for the reactions of SiF2 with Br2, NO2 and C2H 4 were determined as (7.6 + 1.0) × 10 -13, (5.8 -I-0.9) × 10-~3 and < 1 × 10-15 cm 3 molecule-~ s-~, respectively, at room temperature.

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