Abstract

In a recent publication, some electric dipole forbidden, quadrupole allowed ΔJ = +2 and x-type transitions were observed in the chirped-pulse Fourier transform microwave spectrum of two conformations of cyclopropylchloromethyldifluorosilane. Many of these transitions arise from a handful of mixed states and mechanisms are proposed through which these transitions become weakly allowed. Observations of electric dipole forbidden, quadrupole allowed transitions in rotational spectra are unusual for molecules which contain a chlorine nucleus owing to the small quadrupole moment of 35Cl and 37Cl; thus, we believe we are the first to observe x-type transitions arising from perturbations caused by a chlorine nucleus. These transitions represent a breakdown of the meanings of the J, Ka and Kc quantum numbers, leaving only F as a "good" quantum number to describe the interacting states.

Department(s)

Chemistry

Publication Status

Full Text Access

Comments

National Science Foundation, Grant CHE-MRI-2019072

Keywords and Phrases

Chirped-pulse Fourier transform microwave (CP-FTMW) spectroscopy; Electric dipole forbidden; Hyperfine splitting; Quadrupole allowed; Wavefunction mixing; x-type

International Standard Serial Number (ISSN)

1096-083X; 0022-2852

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 Elsevier, All rights reserved.

Publication Date

01 Feb 2026

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Chemistry Commons

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