Millimeter-wave spectra of the CO dimer: Three new states and further evidence of distinct isomers

Jian Tang, A. Robert W McKellar, L. A. Surin, D. N. Fourzikov, B. S. Dumesh, G. Winnewisser

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The millimeter-wave spectrum of the normal isotope of the CO dimer, (12C16O)2, has been systematically surveyed in the regions 75-105 and 131-174 GHz, with additional measurements covering the entire 60-176 GHz range. By combining these results and using the technique of combination differences based on previously known energy levels, 14 new rotational levels have been assigned and precisely (≈0.1 MHz) located. They belong to 3 completely new states, 1 with A+ symmetry and 2 with A- symmetry. The position of the lowest energy A- state results in a new and lower value for the effective tunneling splitting of the CO dimer, 3.73 cm-1. The observation of dramatically different intensities for different bands supports the concept of two isomeric forms for (CO)2, the ground state having a larger intermolecular separation (≈4.4 Å) with most likely a C-bonded configuration, and the low-lying (0.88 cm-1) excited state having a smaller separation (≈4.0 Å) and an O-bonded geometry.

Original languageEnglish
Pages (from-to)87-93
Number of pages7
JournalJournal of Molecular Spectroscopy
Volume214
Issue number1
DOIs
Publication statusPublished - 2002
Externally publishedYes

Fingerprint

Carbon Monoxide
Millimeter waves
Isomers
Dimers
millimeter waves
isomers
dimers
symmetry
coverings
isotopes
energy levels
Excited states
Isotopes
Electron energy levels
Ground state
ground state
geometry
configurations
excitation
Geometry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Millimeter-wave spectra of the CO dimer : Three new states and further evidence of distinct isomers. / Tang, Jian; McKellar, A. Robert W; Surin, L. A.; Fourzikov, D. N.; Dumesh, B. S.; Winnewisser, G.

In: Journal of Molecular Spectroscopy, Vol. 214, No. 1, 2002, p. 87-93.

Research output: Contribution to journalArticle

Tang, Jian ; McKellar, A. Robert W ; Surin, L. A. ; Fourzikov, D. N. ; Dumesh, B. S. ; Winnewisser, G. / Millimeter-wave spectra of the CO dimer : Three new states and further evidence of distinct isomers. In: Journal of Molecular Spectroscopy. 2002 ; Vol. 214, No. 1. pp. 87-93.
@article{02900cd4417e4978b33891c163cbb1b2,
title = "Millimeter-wave spectra of the CO dimer: Three new states and further evidence of distinct isomers",
abstract = "The millimeter-wave spectrum of the normal isotope of the CO dimer, (12C16O)2, has been systematically surveyed in the regions 75-105 and 131-174 GHz, with additional measurements covering the entire 60-176 GHz range. By combining these results and using the technique of combination differences based on previously known energy levels, 14 new rotational levels have been assigned and precisely (≈0.1 MHz) located. They belong to 3 completely new states, 1 with A+ symmetry and 2 with A- symmetry. The position of the lowest energy A- state results in a new and lower value for the effective tunneling splitting of the CO dimer, 3.73 cm-1. The observation of dramatically different intensities for different bands supports the concept of two isomeric forms for (CO)2, the ground state having a larger intermolecular separation (≈4.4 {\AA}) with most likely a C-bonded configuration, and the low-lying (0.88 cm-1) excited state having a smaller separation (≈4.0 {\AA}) and an O-bonded geometry.",
author = "Jian Tang and McKellar, {A. Robert W} and Surin, {L. A.} and Fourzikov, {D. N.} and Dumesh, {B. S.} and G. Winnewisser",
year = "2002",
doi = "10.1006/jmsp.2002.8579",
language = "English",
volume = "214",
pages = "87--93",
journal = "Journal of Molecular Spectroscopy",
issn = "0022-2852",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Millimeter-wave spectra of the CO dimer

T2 - Three new states and further evidence of distinct isomers

AU - Tang, Jian

AU - McKellar, A. Robert W

AU - Surin, L. A.

AU - Fourzikov, D. N.

AU - Dumesh, B. S.

AU - Winnewisser, G.

PY - 2002

Y1 - 2002

N2 - The millimeter-wave spectrum of the normal isotope of the CO dimer, (12C16O)2, has been systematically surveyed in the regions 75-105 and 131-174 GHz, with additional measurements covering the entire 60-176 GHz range. By combining these results and using the technique of combination differences based on previously known energy levels, 14 new rotational levels have been assigned and precisely (≈0.1 MHz) located. They belong to 3 completely new states, 1 with A+ symmetry and 2 with A- symmetry. The position of the lowest energy A- state results in a new and lower value for the effective tunneling splitting of the CO dimer, 3.73 cm-1. The observation of dramatically different intensities for different bands supports the concept of two isomeric forms for (CO)2, the ground state having a larger intermolecular separation (≈4.4 Å) with most likely a C-bonded configuration, and the low-lying (0.88 cm-1) excited state having a smaller separation (≈4.0 Å) and an O-bonded geometry.

AB - The millimeter-wave spectrum of the normal isotope of the CO dimer, (12C16O)2, has been systematically surveyed in the regions 75-105 and 131-174 GHz, with additional measurements covering the entire 60-176 GHz range. By combining these results and using the technique of combination differences based on previously known energy levels, 14 new rotational levels have been assigned and precisely (≈0.1 MHz) located. They belong to 3 completely new states, 1 with A+ symmetry and 2 with A- symmetry. The position of the lowest energy A- state results in a new and lower value for the effective tunneling splitting of the CO dimer, 3.73 cm-1. The observation of dramatically different intensities for different bands supports the concept of two isomeric forms for (CO)2, the ground state having a larger intermolecular separation (≈4.4 Å) with most likely a C-bonded configuration, and the low-lying (0.88 cm-1) excited state having a smaller separation (≈4.0 Å) and an O-bonded geometry.

UR - http://www.scopus.com/inward/record.url?scp=0036069481&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036069481&partnerID=8YFLogxK

U2 - 10.1006/jmsp.2002.8579

DO - 10.1006/jmsp.2002.8579

M3 - Article

AN - SCOPUS:0036069481

VL - 214

SP - 87

EP - 93

JO - Journal of Molecular Spectroscopy

JF - Journal of Molecular Spectroscopy

SN - 0022-2852

IS - 1

ER -