Fourier Transform Emission Spectroscopy of theA2Δ–X2Π Transition of SiH and SiD

Ram, R. S.; Engleman, Rolf; Bernath, Peter F.

doi:10.1006/jmsp.1998.7582

Cited by 20 publications

(17 citation statements)

References 60 publications

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“…There have been a lot of studies on SiH and GeH (Kleman and Werhagen, 1953a;Ram et al, 1998), while SnH and PbH have not been sufficiently studied (Alekseyev et al, 1996;Zhao et al, 2017). SiH radical has been attracting great interest over many years, since it plays a significant role in many industrial processes such as plasma vapor deposition (Ram et al, 1998). In 1930, the emission spectrum of SiH was observed using an arc source, and a strong transition near 410 nm was assigned to as the A 2 →X 2 transition (Jackson, 1930).…”

Section: Introductionmentioning

confidence: 99%

“…In 1983, the PECs of SiH were evaluated with the multi-reference double-excitation configuration interaction calculations (Lewerenz et al, 1983). In recent years, there are many calculations about spectroscopic constants of SiH (Ram et al, 1998;Kalemos et al, 2002;Shi et al, 2008Shi et al, , 2013Zhang et al, 2018). In 2013, the PECs of eleven states generated from seven -S states of SiH radical were calculated by the internally contracted multi-reference configuration interaction method with the Davidson correction (icMRCI+Q) (Shi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Introductionmentioning

confidence: 99%

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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“…In order to refine our model for the X 2 Π and A 2 ∆ states the experimental frequencies were collected from the papers given in Table 2. These measurements span J up to 18.5 in the (0 − 1), (0 − 1) and (1 − 1) bands, and J up to 10.5 in the (2 − 0) and Davies et al (1985) DLAR X 2 Π -X 2 Π 0.5 -9.5 (1, 0) 1838 -2094 Betrencourt et al (1986) FTS X 2 Π -X 2 Π 0.5 -15.5 (1,0), (2, 1), (3, 2) 1704 -2142 Ram et al (1998) FTS A 2 ∆-X 2 Π 1.5 -18.5 (0, 0), (1, 1) 23 644 -24 461…”

Section: Refinementmentioning

confidence: 99%

“…Experimentally, rovibrational transition wavelengths for SiH within the ground state were measured extensively during the 1980s (Brown & Robinson 1984;Brown et al 1985;Davies et al 1985;Betrencourt et al 1986;Seebass et al 1987). However, the first recorded wavelengths for SiH were actually for the A 2 ∆ -X 2 Π system starting with Jackson (1930), with the most recent study by Ram et al (1998) building on earlier work (Rochester 1936;Douglas 1957;Verma 1965;Singh & Vanlandingham 1978;Klynning et al 1979). Spectra for this system were also recorded in the gas phase as part of silane glow discharge studies (Nemoto et al 1989;Washida et al 1985;Perrin & Delafosse 1980;Stamou et al 1997).…”

Section: Introductionmentioning

confidence: 99%

ExoMol line lists XXIV: a new hot line list for silicon monohydride, SiH

Yurchenko

Sinden

Lodi

et al. 2017

Monthly Notices of the Royal Astronomical Society

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SiH has long been observed in the spectrum of our Sun and other cool stars. Computed line lists for the main isotopologues of silicon monohydride, 28 SiH, 29 SiH, 30 SiH and 28 SiD are presented. These line lists consider rotation-vibration transitions within the ground X 2 Π electronic state as well as transitions to the low-lying A 2 ∆ and a 4 Σ − states. Ab initio potential energy (PECs) and dipole moment curves (DMCs) along with spin-orbit and electronic-angular-momentum couplings between them are calculated using the MRCI level of theory with the MOLPRO package. The PEC for the ground X 2 Π state is refined to available experimental data with a typical accuracy of around 0.01 cm −1 or better. The 28 SiH line list includes 11,785 rovibronic states and 1,724,841 transitions with associated Einstein-A coefficients for angular momentum J up to 82.5 and covering wavenumbers up to 31340 cm −1 (λ < 0.319 µm). Spectra are simulated using the new line list and comparisons made with various experimental spectra. These line lists are applicable up to temperatures of 5000 K, making them relevant to astrophysical objects such as exoplanetary atmospheres and cool stars and opening up the possibility of detection in the interstellar medium. These line lists are available at the ExoMol (www.exomol.com) and CDS database websites.

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“…The X 2 £+ and A 2 II states of SiO + have been investigated through fast-ion-beam laser spectroscopy (Rosner et al 1998). The emission spectrum of the A-X system of SiH and SiD has been recorded (Ram, Engleman & Bernath 1998). Although He2 has a repulsive ground electronic state, it does possess bound excited states and discrete transitions between them: Focsa, Bernath, & Colin (1998) have obtained new spectra and carried out a global analysis of the six lowest excited states of He2.…”

Section: Electronic Spectramentioning

confidence: 99%

Commission 14: Atomic and Molecular Data: (Donnees Atomiques et Moleculaires)

Rostas¹,

Smith²,

Berrington³

et al. 2000

Trans. Int. Astron. Union

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In recognition of its special interdisciplinary character, IAU Commission 14 is linked directly to the Executive Committee. The Commission’s role is to inform the astronomical community of new developments in the diverse fields of research which involve atoms and molecules. Conversely it endeavors to sensitize the research community active in those fields to the specific needs of astronomy, especially concerning basic data and modeling tools. More generally, Commission 14 tries to foster long term relations and collaborations between the two communities and, when necessary, to alert funding authorities to the specific needs of ground and space based astronomy for specific atomic and molecular data. This report is one of the main contributions of Commission 14 to the information of the astronomical community. Several meetings concerned, at least in part, with the need and availability of atomic and molecular data for astrophysics were also sponsored or co-sponsored. In the last triennium, Commission 14 cosponsored IAU Symposium 194 “Astrochemistry: From Molecular Cloud to Planetary Systems” held in Sogwipo (Korea) from Aug. 23 to 27, 1999 and organized by Commission 34. A Joint Discussion: JD1 on “Atomic and Molecular Data for Astrophysics, New Developments, Case Studies and Future Needs” has been planned for the XXIVth IAU General Assembly in Manchester (Aug. 7-19, 2000) and cosponsored by Commissions 15, 16, 29, 34, 36, 40 and 44. Several other Joint Discussions to be held at the Manchester General Assembly are co-sponsored by this commission.

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Fourier Transform Emission Spectroscopy of theA2Δ–X2Π Transition of SiH and SiD

Cited by 20 publications

References 60 publications

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

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

ExoMol line lists XXIV: a new hot line list for silicon monohydride, SiH

Commission 14: Atomic and Molecular Data: (Donnees Atomiques et Moleculaires)

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