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Deb N, Heazlewood BR, Rennick CJ, et al. Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). J Chem Phys. 2014;140(16):164314doi: 10.1063/1.4870644.
Deb, N., Heazlewood, B. R., Rennick, C. J., & Softley, T. P. (2014). Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). The Journal of chemical physics, 140(16), 164314. https://doi.org/10.1063/1.4870644
Deb, Nabanita, et al. "Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+)." The Journal of chemical physics vol. 140,16 (2014): 164314. doi: https://doi.org/10.1063/1.4870644
Deb N, Heazlewood BR, Rennick CJ, Softley TP. Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+). J Chem Phys. 2014 Apr 28;140(16):164314. doi: 10.1063/1.4870644. PMID: 24784277.
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J Chem Phys. 2014 Apr 28;140(16):164314. doi: 10.1063/1.4870644.

Laser induced rovibrational cooling of the linear polyatomic ion C2H2(+).

The Journal of chemical physics

Nabanita Deb, Brianna R Heazlewood, Christopher J Rennick, Timothy P Softley

Affiliations

  1. Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom.

PMID: 24784277 DOI: 10.1063/1.4870644

Abstract

The laser-induced blackbody-assisted rotational cooling of a linear polyatomic ion, C2H2(+), in its (2)Π ground electronic state in the presence of the blackbody radiation field at 300 K and 77 K is investigated theoretically using a rate-equations model. Although pure rotational transitions are forbidden in this non-polar species, the ν5 cis-bending mode is infrared active and the (1-0) band of this mode strongly overlaps the 300 K blackbody spectrum. Hence the lifetimes of state-selected rotational levels are found to be short compared to the typical timescale of ion trapping experiments. The ν5 (1-0) transition is split by the Renner-Teller coupling of vibrational and electronic angular momentum, and by the spin-orbit coupling, into six principal components and these effects are included in the calculations. In this paper, a rotational-cooling scheme is proposed that involves simultaneous pumping of a set of closely spaced Q-branch transitions on the (2)Δ5/2 - (2)Π3/2 band together with two Q-branch lines in the (2)Σ(+) - (2)Π1/2 band. It is shown that this should lead to >70% of total population in the lowest rotational level at 300 K and over 99% at 77 K. In principle, the multiple Q-branch lines could be pumped with just two broad-band (∼Δν = 0.4-3 cm(-1)) infrared lasers.

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