Browsing by Author "Sumiyoshi, Yoshihiro"

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Fourier-transform microwave spectroscopy of the H-2-HCN complex
(2012-12-03)
Ishiguro, Masazumi
;
Harada, Kensuke
;
Tanaka, Keiichi
;
Tanaka, Takehiko
;
Sumiyoshi, Yoshihiro
Fourier-transform microwave spectroscopy was applied to observe the J = 1-0 rotational transition of the H-2-HCN complex for both the ortho-and para-H-2 species to obtain improved molecular constants by an analysis combined with the millimeter-wave data. It was confirmed that the para-and ortho-H-2 species have different configurations: namely H-2 is attached to the H end of HCN in the former, while to the N end in the latter. For the ortho-H-2 species, the hyperfine splitting due to the magnetic interaction between the hydrogen nuclei was observed to give the nuclear spin-spin coupling constant d(H) = 54.6(38) kHz. (C) 2012 Elsevier B.V. All rights reserved.
Hyperfine analysis of the microwave spectrum of the vinylthio radical, CH2CHS
(2018-11-01)
Nakajima, Masakazu
;
Tokumasu, Takanobu
;
Sumiyoshi, Yoshihiro
;
Endo, Yasuki
;
應用化學系
Measurement of pure rotational transitions for the vinylthio radical, CH2CHS, previously observed by Fourier-transform microwave spectroscopy (Nakajima et al., 2007), are extended to a number of fine and hyperfine component lines split by the unpaired electron spin and the three non-equivalent protons. All the measured transition frequencies have been analyzed by a Hamiltonian for doublet asymmetric top molecules with hyperfine interaction terms for three nuclear spins, yielding precise molecular constants of CH2CHS in the ground state. Discussions on the electronic structure of CH2CHS are given based on the determined molecular constants. (C) 2018 Elsevier Inc. All rights reserved.