High-resolution Fourier-transform study of the X22Π3/2→X12Π1/2 fine structure transitions of PbH and PbD

Setzer, K.D.; Borkowska‐Burnecka, J.; Żyrnicki, W.; Fink, E.H.

doi:10.1016/j.jms.2008.08.003

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…There exist many other transitions which are reported in the literature for different plasmas used for specific applications, for example [38,[201][202][203][204][205][206][207]; however, a complete overview is outside the scope of this review.…”

Section: Short Overview Of Often-used Ro-vibrational Transitionsmentioning

confidence: 99%

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Bruggeman

Sadeghi

Schram

et al. 2014

Plasma Sources Sci. Technol.

420

431

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The gas temperature in non-equilibrium plasmas is often obtained from the plasma-induced emission by measuring the rotational temperature of a diatomic molecule in its excited state. This is motivated by both tradition and the availability of low budget spectrometers. However, non-thermal plasmas do not automatically guarantee that the rotational distribution in the monitored vibrational level of the diatomic molecule is in equilibrium with the translational (gas) temperature. Often non-Boltzmann rotational molecular spectra are found in non-equilibrium plasmas. The deduction of a gas temperature from these non-thermal distributions must be done with care as clearly the equilibrium between translational and rotational degrees of freedom cannot be achieved. In this contribution different methods and approaches to determine the gas temperature are evaluated and discussed. A detailed analysis of the gas temperature determination from rotational spectra is performed. The physical and chemical background of non-equilibrium rotational population distributions in molecular spectra is discussed and a large range of conditions for which non-equilibrium occurs are identified. Fitting procedures which are used to fit (non-equilibrium) rotational distributions are analyzed in detail. Lastly, recommendations concerning the conditions for which the gas temperatures can be obtained from diatomic spectra are formulated.

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Section: Short Overview Of Often-used Ro-vibrational Transitionsmentioning

confidence: 99%

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Bruggeman

Sadeghi

Schram

et al. 2014

Plasma Sources Sci. Technol.

420

431

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“…In 1938, the emission spectrum of PbH was firstly detected using arc-excitation in hydrogen atmosphere (Watson, 1938). In 2008, the near-infrared emission spectra of X 2 3/2 → 2 1/2 transitions of PbH were observed using highresolution Fourier-transform spectrometry (Setzer et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Study on Laser Cooling Feasibility of Group IVA Hydrides XH (X = Si, Ge, Sn, and Pb): The Role of Electronic State Crossing

et al. 2020

Front. Chem.

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The feasibility of direct laser cooling of SiH, GeH, SnH, and PbH is investigated and assessed based upon first principles. The internally contracted multi-reference configuration interaction method with the Davidson correction is applied. Very good agreement is obtained between our computed spectroscopic constants and the available experimental data. We find that the locations of crossing point between the B 2 − and A 2 states have the tendency of moving downwards from CH to SnH relative to the bottom of the corresponding A 2 potential, which precludes the laser cooling of GeH, SnH, and PbH. By including the spin-orbit coupling effects and on the basis of the A 2 5/2 →X 2 3/2 transition, we propose a feasible laser cooling scheme for SiH using three lasers with wavelengths varying from 400 to 500 nm, which features a very large vibrational branching ratio (0.9954) and a very short radiative lifetime (575 ns). Moreover, similar studies are extended to carbon monosulfide (CS) with a feasible laser cooling scheme proposed. The importance of electronic state crossing in molecular laser cooling is underscored, and our work suggests useful caveats to the choice of promising candidates for producing ultracold molecules.

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“Small” Molecule

Бацанов

Batsanov

2012

Introduction to Structural Chemistry

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High-resolution Fourier-transform study of the X22Π3/2→X12Π1/2 fine structure transitions of PbH and PbD

Cited by 10 publications

References 26 publications

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

Gas temperature determination from rotational lines in non-equilibrium plasmas: a review

A Theoretical Study on Laser Cooling Feasibility of Group IVA Hydrides XH (X = Si, Ge, Sn, and Pb): The Role of Electronic State Crossing

“Small” Molecule

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