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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 121, 2023 - Issue 17-18: Special Issue Dedicated to Wim Ubachs
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Wim Ubachs Festschrift

The emission spectroscopy of the astrophysically significant B2Σ–X2Π system of CD: further investigation

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Article: e2128459 | Received 02 Jun 2022, Accepted 17 Sep 2022, Published online: 29 Sep 2022
 

Abstract

The B2ΣX2Π(01) band has been identified and measured in the laboratory spectrum of the CD molecule for the first time. The emission from the discharge was observed with a high accuracy dispersive optical spectroscopy technique using a plane-grating spectrograph and recorded by a photomultiplier tube. In total, 99 ro-vibronic frequencies were measured with an absolute accuracy of about ±0.010 cm1. In the following work, we present the results of the combined analysis of the current experimental data and the B2ΣX2Π(0−0) [Szajna et al., J. Mol. Spectrosc. 324, 48–52 (2016)] and D2ΠiB2Σ(0−0) [Herzberg and Johns, Astrophys. J. 158, 399–417 (1969)] bands of CD. The resulting data, compared to those from the earlier measurements, present more accurate molecular constants for the v = 0 vibrational level of the B2Σ and D2Πi states. The parameters of the Λ-doubling (p, q) of the D2Πi(v = 0) level were obtained for the first time. The current observations and analysis have become a basis to discuss the possible detection of the CD radical in the interstellar medium by the R2(0.5), Q2(0.5)+QR12(0.5) and PQ12(0.5) spectral lines of the B2ΣX2Π(00) band in the 3880 Å region.

GRAPHICAL ABSTRACT

Acknowledgements

We dedicate this work to Professor Wim Ubachs (Vrije Universiteit) on the occasion of his 65th birthday and in recognition of his outstanding contribution to laser and molecular spectroscopy as well as metrology leading into physics beyond the Standard Model.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been corrected with minor changes. These changes do not impact the academic content of the article.

Notes

1 Originally the lines were numbered by N value rather than by J value.

Additional information

Funding

We express our gratitude for the financial support of the European Regional Development Fund and the Polish state budget within the framework of the Carpathian Regional Operational Programme [grant number RPPK.01:03:00-18-001/10] for the period 2007–2013 through the funding of the Centre for Innovation and Transfer of Natural Science and Engineering Knowledge of the University of Rzeszów.
This article is part of the following collections:
Special Issue Dedicated to Wim Ubachs

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