Ultraviolet photodissociation of methanethiol (CH₃SH): revealing an S(¹D) atom elimination channel.

ABSTRACT: We report time-sliced velocity map imaging studies of the methyl (CH₃) and electronically excited sulfur (S(¹D)) fragments formed following the photoexcitation of jet-cooled CH₃SH molecules in the 2¹A'' ← X̃ ¹A' absorption band (i.e. at wavelengths in the range 190 ≤ λ ≤ 210 nm). Analyses of images of CH₃ fragments in their v ₂ = 0, 1 and 2 vibrational levels confirm the perpendicular parent transition dipole moment and prompt bond fission and show that the ground state SH(X) partners are formed with an inverted vibrational population distribution, peaking at v = 2 at the shortest excitation wavelengths investigated. Most of the photolysis photon energy above that required to break the

SUBMITTER: Wu Y 

PROVIDER: S-EPMC12396137 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature