Time resolved studies of collisional transfer and radiative decay of the CS A 1Π state

Carlson, Thomas A.; Copley, J. R. D.; Duric, Nada; Erman, P.; Larsson, Mats

doi:10.1016/0301-0104(79)85169-1

Cited by 33 publications

(22 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The collision free lifetimes measured using HFD (9) up to £ Å 5 show the same qualitative behavior, but the £ Å 0 to £ Å 1 increment is larger than predicted (Fig. 6).…”

supporting

confidence: 57%

“…The transition moment function is then fitted to the re-with measurements by LIF (8), HFD (9), and the Hanle effect (15), which range between 175 and 200 nsec. The maining points, neglecting both the 1,2 and 4,4 bands.…”

Section: Table 1 Summary Of the Experimental Branching Ratios Of Csmentioning

confidence: 99%

“…1 P-X 1 S / band system are scarce (7)(8)(9). The main difficulty in a systematic study of this transition is the high The CS radical has been observed as a product in both degree of perturbation of many A state rotational levels by the ultraviolet photolysis and the collisional dissociation, via nearby triplet states, leading to anomalies in line positions, metastable rare gas atoms, of the parent molecules CS 2 , intensities, and lifetimes (8,(10)(11)(12)(13).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Transition Probabilities in theA1Π–X1Σ+System of CS

Mahon

Stampanoni

Luque

et al. 1997

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

“…The collision free lifetimes measured using HFD (9) up to £ Å 5 show the same qualitative behavior, but the £ Å 0 to £ Å 1 increment is larger than predicted (Fig. 6).…”

supporting

confidence: 57%

Section: Table 1 Summary Of the Experimental Branching Ratios Of Csmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Transition Probabilities in theA1Π–X1Σ+System of CS

Mahon

Stampanoni

Luque

et al. 1997

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

“…This indicates that the C − X (0 − 0) transition should be extremely strong, which agrees with the experimental VUV absorption spectra of Donovan et al (1970) and Stark et al (1987). Among 1 Π states, 3 1 Π has the largest transition dipole moment, which is about 0.7 a.u.. To verify our transition dipole moment calculations, we determined f -values for the A − X system for comparison with available experimental and theoretical results (e.g., Carlson et al 1979;Mahon et al 1997;Ornellas 1998;Li et al 2013). The suite of oscillator strengths is in excellent agreement.…”

Section: Pecs and Tdmssupporting

confidence: 72%

Ab Initio Study of Ground-state CS Photodissociation via Highly Excited Electronic States

Luo

Federman

et al. 2019

ApJ

View full text Add to dashboard Cite

Photodissociation by ultraviolet radiation is the key destruction pathway for CS in photon-dominated regions, such as diffuse clouds. However, the large uncertainties of photodissociation cross sections and rates of CS, resulting from a lack of both laboratory experiments and theoretical calculations, limit the accuracy of calculated abundances of S-bearing molecules by modern astrochemical models. Here we show a detailed ab initio study of CS photodissociation. Accurate potential energy curves of CS electronic states were obtained by choosing an active space CAS(8,10) in MRCI+Q/aug-cc-pV(5+d)Z calculation with additional diffuse functions, with a focus on the B and C 1 Σ + states. Cross sections for both direct photodissociation and predissociation from the vibronic ground state were calculated by applying the coupled-channel method. We found that the C −X (0−0) transition has extremely strong absorption due to a large transition dipole moment in the Franck-Condon region and the upper state is resonant with several triplet states via spin-orbit couplings, resulting in predissociation to the main atomic products C ( 3 P ) and S ( 1 D). Our new calculations show the photodissociation rate under the standard interstellar radiation field is 2.9 × 10 −9 s −1 , with a 57% contribution from C − X (0 − 0) transition. This value is larger than that adopted by the Leiden photodissociation and photoionization database by a factor of 3.0. Our accurate ab initio calculations will allow more secure determination of S-bearing molecules in astrochemical models.

show abstract

“…In particular, the predicted frequency for the J = 1 − 0 transition in v = 0 was 453037 MHz, with no estimation of the uncertainty. Carlson et al (1980) identified two new bands of the electronic transition, and improved the molecular constants. Davies & Martineau (1988) detected the fundamental vibration-rotation band of SiH + in a silane plasma with diode laser spectroscopy.…”

Section: Introductionmentioning

confidence: 97%

Accurate Frequency Determination of Vibration–Rotation and Rotational Transitions of SiH⁺

Doménech

Asvany

2017

ApJ

View full text Add to dashboard Cite

The fundamental SiH ion has been characterized in a collaborative work, utilizing a hollow-cathode-discharge laser-spectrometer and a cryogenic ion trap spectrometer. Twenty-three vibration-rotation transitions around 4.75 m have been detected with high accuracy. This has facilitated the first direct measurement of the pure rotational transition = 1 ← 0 at 453056.3632(4) MHz in the trap spectrometer. The measured and accurately predicted transitions enable the search for this ion in space with IR and sub-mm telescopes.

show abstract

Time resolved studies of collisional transfer and radiative decay of the CS A 1Π state

Cited by 33 publications

References 26 publications

Transition Probabilities in theA1Π–X1Σ+System of CS

Transition Probabilities in theA1Π–X1Σ+System of CS

Ab Initio Study of Ground-state CS Photodissociation via Highly Excited Electronic States

Accurate Frequency Determination of Vibration–Rotation and Rotational Transitions of SiH⁺

Contact Info

Product

Resources

About

Time resolved studies of collisional transfer and radiative decay of the CS A 1Π state

Cited by 33 publications

References 26 publications

Transition Probabilities in theA1Π–X1Σ+System of CS

Transition Probabilities in theA1Π–X1Σ+System of CS

Ab Initio Study of Ground-state CS Photodissociation via Highly Excited Electronic States

Accurate Frequency Determination of Vibration–Rotation and Rotational Transitions of SiH+

Contact Info

Product

Resources

About

Accurate Frequency Determination of Vibration–Rotation and Rotational Transitions of SiH⁺