Title: High-resolution infrared spectroscopy of HCF in the CH stretch region

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.5133397 · OSTI ID:1801532

We present the results from a high-resolution infrared study of jet-cooled singlet monofluorocarbene (HCF) in the CH stretch region near 2600 cm-1. Absorption signals are recorded using near quantum shot noise limited laser absorption methods. The fully resolved absorption spectra of the CH stretch (ν1) fundamental band and a partial progression of transitions of the HCF bend plus CF stretch (ν2 + ν3) combination band are observed and show clear evidence of a strong rovibrational coupling between the ν1 $$K^{'}_{a}$$ = 2 and ν2 + ν3 $$K^{'}_{a}$$ = 3 manifolds, including the observation of “dark state” transitions. A detailed perturbation analysis of a c-type Coriolis interaction is carried out for these two coupled vibrational states, providing experimental determination of precise rovibrational constants. A combined ground state combination difference fit of the transitions to the ν1 and ν2 + ν3 vibrational states in this study with previously reported LIF Ã(0,0,0) ← $$\tilde {X}$$(0,0,0) data has been done to increase the accuracy of the ground state rotational constants [M. Kakimoto et al., J. Mol. Spec. 88, 300–310 (1981)]. Moreover, we report, for the first time, hot band (ν1 + ν3 ← ν3) transitions due to vibrationally excited HCF in the CF stretch mode, ν3. The high-resolution results for all vibrational frequencies and rotational constants are in good agreement with and significantly extend the analysis of the rovibrational manifold of HCF. Finally, the present ground state and ν3 spectroscopic parameters now permit improved predictions for pure rotational and ν3 fundamental transitions to aid spectral searches for HCF in the laboratory and the interstellar medium.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0002123
OSTI ID:
1801532
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 1 Vol. 152; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (38)

The role of databases in support of computational chemistry calculations journal October 1996
The Fundamental Bands of H35Cl and H37Cl: Line Positions from High-Resolution Laboratory Data journal May 1993
Doppler-limited dye laser excitation spectroscopy of HCF journal August 1981
Vibration–Rotation Structure in Asymmetric- and Symmetric-Top Molecules book January 1972
Lifetime lengthening and the Renner–Teller effect in the HCF (Ã1A″←X̃1A′) system journal September 2003
High-resolution infrared spectra of vibrationally excited HC4H in a supersonic hydrocarbon plasma jet journal February 2014
Concentration modulation spectroscopy with a pulsed slit supersonic discharge expansion source journal August 2001
Basis Set Exchange:  A Community Database for Computational Sciences journal March 2007
Chlorofluorocarbons and stratospheric ozone journal May 1987
Vibrational and rotational relaxation of iodine in seeded supersonic beams journal April 1979
On the Renner−Teller Effect and Barriers to Linearity and Dissociation in HCF(Ã 1 A‘ ‘) journal April 2004
Stimulated Emission Pumping Spectroscopyof the [X̃] 1 A‘ State of CHF journal January 2008
Protostellar and cometary detections of organohalogens journal October 2017
Herschelobservations of EXtra-Ordinary Sources (HEXOS): Detection of hydrogen fluoride in absorption towards Orion KL journal July 2010
HIFI detection of hydrogen fluoride in the carbon star envelope IRC +10216 journal August 2011
Depletion of chlorine into HCl ice in a protostellar core: The CHESS spectral survey of OMC-2 FIR 4⋆ journal February 2015
Discovery of interstellar CF + journal July 2006
Vibrational excitation and relaxation of five polyatomic molecules in an electrical discharge journal May 2005
Dispersed fluorescence spectroscopy of jet-cooled HCF and DCF: Vibrational structure of the X̃A′1 state journal July 2005
General contraction of Gaussian basis sets. I. Atomic natural orbitals for first‐ and second‐row atoms journal April 1987
Optical–optical double resonance (stimulated emission pumping) spectroscopy of HCF journal June 1988
Theoretical potential energy and electric dipole moment functions of HCF ( X   1 A ’ and a   3 A ‘) journal June 1990
Infrared spectroscopy of jet-cooled HCCl singlet chlorocarbene diradical: CH stretching and vibrational coupling dynamics journal August 2018
Treatment of Fermi resonance effects on transition moments in vibrational perturbation theory journal January 2007
Calculated stretching overtone levels and Darling–Dennison resonances in water: a triumph of simple theoretical approaches journal October 2007
Discovery of Interstellar Hydrogen Fluoride journal October 1997
Direct Determination of the hf/h 2 Abundance Ratio in Interstellar gas journal February 2013
a Herschel /Hifi Legacy Survey of hf and h 2 o in the Galaxy: Probing Diffuse Molecular Cloud Chemistry journal June 2015
Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life journal June 2018
Rotational Analysis of Bands of the hcf Molecule journal July 1966
The Chemical Composition of the Sun journal September 2009
Frequency stability measurements on polarization-stabilized He–Ne lasers journal January 1988
A Molecular Beam Microwave Fourier Transform (MB-MWFT) Spectrometer with an Electric Discharge Nozzle journal October 1991
Gas-grain Fluorine and Chlorine Chemistry in the Interstellar Medium journal November 2017
Direct Determination of the HF/H2 Abundance Ratio in Interstellar Gas text January 2013
A Herschel/HIFI Legacy Survey of HF and H2O in the Galaxy: Probing Diffuse Molecular Cloud Chemistry text January 2015
Discovery of Interstellar Hydrogen Fluoride text January 1997
Protostellar and cometary detections of organohalogens text January 2017

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