Search for excitation selectivity in infrared multiple photon dissociation. 1,1,1-Trideuterio-2,5-dithiahex-3-yne

10.5-eV photoionization mass spectrometry of aliphatic compounds

“…everal applications of coherent vacuum ultraviolet (VUV) phoroionization have appeared over the past few years [1][2][3][4][5][6]. Although it is possible to generate coherent VUV radiation down to the LiP cutoff at 110 nm [7][8][9][10][11][12], 118 nm (10.5 eV) is perhaps the most convenient wavelength for mass spectrometry.…”

“…Coherent VUV radiation can be used to detect neutral products of unimolecular decomposition. For example, Welge and co-workers have identified neutral products from infrared multiphoton dissociation of 1,1,1-Trideuterio-2,5-dithiahex-3-yne [1] and acetic anhydride [2] by postionization with 10.5-eV radiation. Coherent VUV radiation can also be used to ionize desorbed neutrals.…”

Unsymmetrically, chemically activated 1,2-dicyclopropylacetylene: an example of restricted energy flow?

“…It seems reasonable that process should be represented by d*. As deduced earlier, and summarized in Figure 1, there is approximately 48 kcal/mol more enthalpy available than is required to maintain dicyclopropylacetylene 4 (17) Bauschlicher, C. W., Jr.; Schaefer, H. F. Ill; Bagus, P. S. J. Am.…”

“…In order to minimize isotope effects on the interpretation, the study includes the addition of CD2 and CH2 to undeuteriated cyclopropylvinylacetylene and to l-(2,2-dideuteriocyclopropyl)-2-vinylacetylene, respectively. Three dideuterio isomers of allylcyclopropylacetylene, 1, 2, and 3, are expected, and these should be the same in structure, if not in amount, as those obtained by direct thermal rearrangement of l-cyclopropyl-2-(2,2-dideuteriocyclopropyljacetylene (4).…”

“…Replotting log (S/D) of "Figure 3 "A mixture of dideuterioallylcyclopropylacetylenes 1, 2, and 3 (ACA-d2). 4 A mixture of dideuteriocyclopropyl-Zrans-propenylacetylenes (C-Z-PA-d2).…”