Microwave spectra of the methylpolyynes CH₃(C≡C)₄H and CH₃(C≡C)₅H

verfasst von

M. J. Travers, W. Chen, J. U. Grabow, M. C. McCarthy, P. Thaddeus

Abstract

Following the laboratory detection by Fourier transform microwave spectroscopy of the four new methylcyanopolyynes described in the accompanying paper by W. Chen et al. (J. Mol. Spectrosc. 1998), we detected two new methylpolyynes, CH₃(C≡C)₄H and CH₃(C≡C)₅H. The strongest lines of both molecules, obtained in a discharge with a dilute mixture of methylacetylene and diacetylene in neon, were quite intense: after 4 min of integration, a signal to noise of about 300 for the strongest lines of CH₃(C≡C)₄H and 30 for those of CH₃(C≡C)₅H. Enough rotational transitions from the K = 0 and 1 ladders were detected in either molecule to be confident of the identification and to determine the rotational and leading centrifugal distortion constants to high accuracy. Like other carbon chains, the two here may be important in combustion processes and may be detectable in the interstellar gas, where the two shortest methylpolyynes have already been observed,

Externe Organisation(en)

Harvard University

Typ

Artikel

Journal

Journal of molecular spectroscopy

Band

192

Seiten

12-16

Anzahl der Seiten

5

ISSN

0022-2852

Publikationsdatum

11.1998

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Atom- und Molekularphysik sowie Optik, Spektroskopie, Physikalische und Theoretische Chemie

Elektronische Version(en)

https://doi.org/10.1006/jmsp.1998.7666 (Zugang: Geschlossen)