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Methyl radical measurement by cavity ring-down spectroscopy

✍ Scribed by P. Zalicki; Y. Ma; R.N. Zare; E.H. Wahl; J.R. Dadamio; T.G. Owano; C.H. Kruger

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 447 KB
Volume: 234
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)00046-7

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✦ Synopsis

Cavity ring-down spectroscopy has been used to measure the absorbance of methyl radicals near 216 nm. The methyl radicals are generated by a hot tungsten filament heated to 2300 K in a mixture of 0.5% CH 4 in H~ slowly flowing through the reactor at 20 Torr total pressure. CH 3 absorbances are detected with a noise-equivalent sensitivity of two parts in 105 using a narrow pencil of UV light 0.5 mm in diameter, which allows measurement of spatial profiles of CH 3 for column densities of 3 × 1012 radicals/cm 2 (3 x 1012 radicals/era 3 × 1 cm absorption pathlength).

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