Photodissociation thresholds of OH from CH3OH in solid Ne and Ar were deter
mined via photolysis of CH3OH/Ne and CH3OH/Ar (1/200) samples in situ at 4
K. The samples were irradiated with VUV synchrotron radiation after dispers
ion by a Seya-Namioka monochromator. The OH photo-product was detected by m
eans of laser-induced fluorescence technique. The increase of fluorescent i
ntensity of OH was monitored and recorded after the matrix sample was irrad
iated at different wavelengths for 3-5 min. Photodissociation threshold ene
rgies of 7.13 +/- 0.02 eV (174.0 +/- 0.5 nm) and 7.08 +/- 0.04 eV (175.0 +/
- 1.0 nm) were measured for OH production of CH3OH in solid Ne and Ar, resp
ectively. (C) 2001 Elsevier Science B.V. All rights reserved.