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- W2065793485 abstract "A crossed laser and molecular beam photofragmentation apparatus is described. The apparatus is equipped with a rotatable molecular beam source and a translationally movable ultrahigh vacuum mass spectrometer for time-of-flight (TOP) measurements. Using this apparatus we have measured the TOP spectra of S and CS resulting from the photofragmentation processes, CS^ + hv (193 nm) —> CS(X, v) + S(^D or ^P). The translational energy distributions of photofragments derived from the S and CS TOP spectra are in good agreement This observation, together with the finding that the TOP spectra of S and CS are independent of laser power in the 25-150 mJ range, shows that the further absorption of a laser photon by CS to form C(^P) + S(^P) within the laser pulse is insignificant. The TOP spectra of S obtained at electron ionization energies of 20 and 50 eV are indiscernible, indicating that the contribution to the TOP spectrum of S from dissociative ionization of CS is negligible at electron impact energies < 50 eV. The thermochemical thresholds for the S^D) and S(^P) channels are determined to be 18.7 and 45.0 ± 0.4 kcal/mol, respectively, consistent with literature values. Structures found in the translational energy distribution can be correlated with vibrational structures of CS(X, v = 0-5) associated with the S CD) channel. The translational energy distribution supports the previous observation that the vibrational state distribution of CS(X, v) is peaked at v = 3. The TOP experiment is also consistent with the S(^P)/S(*D) ratio of 2.8 ± 0.3 determined in a recent vacuum ultraviolet laser induced fluorescence measurement on the S" @default.
- W2065793485 created "2016-06-24" @default.
- W2065793485 creator A5080331648 @default.
- W2065793485 date "2018-08-13" @default.
- W2065793485 modified "2023-09-23" @default.
- W2065793485 title "Vacuum ultraviolet photodissociation and photoionization of selected organosulfur compounds" @default.
- W2065793485 cites W1569598449 @default.
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- W2065793485 doi "https://doi.org/10.31274/rtd-180813-12891" @default.
- W2065793485 hasPublicationYear "2018" @default.
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