Terahertz spectroscopy of CaH

Jin Furuta; Kaori Kobayashi; Fusakazu Matsushima; Yoshiki Moriwaki; Hiroyuki Ozeki; Stephen C. Ross

doi:10.1016/j.cplett.2025.142019

Terahertz spectroscopy of CaH

Jin Furuta, Kaori Kobayashi^*, Fusakazu Matsushima, Yoshiki Moriwaki, Hiroyuki Ozeki, Stephen C. Ross

^*Corresponding author for this work

Program of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Calcium monohydride, CaH, has been a molecule of astrophysical interest ever since its first identification in sunspots. For astrophysical use it is therefore important to provide rest frequencies in the terahertz range. We observed pure rotational transitions for the υ = 0, and υ = 1 levels. This is the first report of pure rotational spectra of the υ = 1 level. We also performed a global fitting of the effective molecular constants for the υ = 0 to υ = 4 levels of the electronic ground state along with infrared transitions from previous studies.

Original language	English
Article number	142019
Journal	Chemical Physics Letters
Volume	869
DOIs	https://doi.org/10.1016/j.cplett.2025.142019
State	Published - 2025/06/16

Keywords

CaH
Microwave spectroscopy
Pure rotational transitions
Rotational spectroscopy
Terahertz spectroscopy

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

Access to Document

10.1016/j.cplett.2025.142019

Cite this

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title = "Terahertz spectroscopy of CaH",

abstract = "Calcium monohydride, CaH, has been a molecule of astrophysical interest ever since its first identification in sunspots. For astrophysical use it is therefore important to provide rest frequencies in the terahertz range. We observed pure rotational transitions for the υ = 0, and υ = 1 levels. This is the first report of pure rotational spectra of the υ = 1 level. We also performed a global fitting of the effective molecular constants for the υ = 0 to υ = 4 levels of the electronic ground state along with infrared transitions from previous studies.",

keywords = "CaH, Microwave spectroscopy, Pure rotational transitions, Rotational spectroscopy, Terahertz spectroscopy",

author = "Jin Furuta and Kaori Kobayashi and Fusakazu Matsushima and Yoshiki Moriwaki and Hiroyuki Ozeki and Ross, {Stephen C.}",

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doi = "10.1016/j.cplett.2025.142019",

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T1 - Terahertz spectroscopy of CaH

AU - Furuta, Jin

AU - Kobayashi, Kaori

AU - Matsushima, Fusakazu

AU - Moriwaki, Yoshiki

AU - Ozeki, Hiroyuki

AU - Ross, Stephen C.

PY - 2025/6/16

Y1 - 2025/6/16

N2 - Calcium monohydride, CaH, has been a molecule of astrophysical interest ever since its first identification in sunspots. For astrophysical use it is therefore important to provide rest frequencies in the terahertz range. We observed pure rotational transitions for the υ = 0, and υ = 1 levels. This is the first report of pure rotational spectra of the υ = 1 level. We also performed a global fitting of the effective molecular constants for the υ = 0 to υ = 4 levels of the electronic ground state along with infrared transitions from previous studies.

AB - Calcium monohydride, CaH, has been a molecule of astrophysical interest ever since its first identification in sunspots. For astrophysical use it is therefore important to provide rest frequencies in the terahertz range. We observed pure rotational transitions for the υ = 0, and υ = 1 levels. This is the first report of pure rotational spectra of the υ = 1 level. We also performed a global fitting of the effective molecular constants for the υ = 0 to υ = 4 levels of the electronic ground state along with infrared transitions from previous studies.

KW - CaH

KW - Microwave spectroscopy

KW - Pure rotational transitions

KW - Rotational spectroscopy

KW - Terahertz spectroscopy

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DO - 10.1016/j.cplett.2025.142019

M3 - 学術論文

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SN - 0009-2614

VL - 869

JO - Chemical Physics Letters

JF - Chemical Physics Letters

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