Rotational Satellite Intensities and Triplet Splitting in the B3Σu− State of S2

Meyer, Keith A.; Crosley, David R.

doi:10.1139/p73-277

Cited by 23 publications

(9 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The highly perturbed nature of the absorption and emission bands associated with these vibrational levels long hindered the development of a full spectroscopic analysis. Following earlier work by Meakin and Barrow, 17 Meyer and Crosley, 18 Patino and Barrow, 19 Matsumi et al, 20 and Heaven et al, 21 Green and Western 22,23 provided the first comprehensive rotational analysis of the B(0-9) levels. Their analysis was informed by a combination of new rotationally cold laserinduced fluorescence spectra, room temperature fluorescence spectra, and existing high-temperature (∼1000 K) absorption spectra from Barrow and co-workers, complemented by new radiative lifetime measurements and those of Matsumi et al 24 As first suggested by Meakin and Barrow, 17 the perturbing state has 3 Π u symmetry; it is now labeled as the B 3 Π u state.…”

Section: Introductionmentioning

confidence: 96%

“…Wheeler et al 25 report a rapid onset of broadening at v = 11, with widths maximizing at 14 cm −1 for B(13), followed by gradually decreasing widths, reaching 7 cm −1 for B (17). A second abrupt increase in width occurs at B (18), with the v = 18 and 19 levels having widths estimated by Wheeler et al 25 to be greater than 15 cm −1 and 20 cm −1 , respectively. A subsequent velocitymap imaging study of S( 3 P J ) photodissociation products, by Frederix et al, 26 led to a revised value for the lowest dissociation energy and clarification of the relevant dissociation channels for the B(10) and B(11) levels.…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system

Stark

Herde

Lyons

et al. 2018

The Journal of Chemical Physics

View full text Add to dashboard Cite

Photoabsorption cross sections and oscillator strengths for the strong, predissociating vibrational bands, v ≥ 11, in the S BΣu-3-XΣg-3(v,0) system are reported. Absorption measurements were undertaken on S vapor produced by a radio-frequency discharge through HS seeded in helium, and also in a two-temperature sulfur furnace, at temperatures of 370 K and 823 K, respectively. S column densities were determined in each source by combining experimental line strengths in low-v non-predissociating B - X bands (v < 7) with calculated line f-values based on measured radiative lifetimes and calculated branching ratios. The broad-band capabilities of two vacuum-ultraviolet Fourier-transform spectrometers, used with instrumental resolutions of 0.22 cm and 0.12 cm, respectively, allowed for simultaneous recordings of both non-predissociating and predissociating bands, thus placing the predissociating-band cross sections on a common absolute scale. Uncertainties in the final cross section datasets are estimated to be 15% for the 370-K vapor and 10% for the 823-K vapor. The experimental cross sections are used to inform a detailed predissociation model of the B(v) levels in Paper II [Lewis et al., J. Chem. Phys. 148, 244303 (2018)]. For astrophysical and other applications, this model can be adjusted simply to provide isotopologue-specific cross sections for a range of relevant temperatures.

show abstract

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system

Stark

Herde

Lyons

et al. 2018

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…8 Many efforts have been made to perform deperturbation analyses, with the early work summarized by Barrow and Du Parcq. 9 Only after the supersonic free jet studies of Matsumi et al., 10,11 in which transitions to the B and B" states were distinguished, was a full assignment of the band system possible.…”

Section: Introductionmentioning

confidence: 99%

Photodissociation Imaging of Diatomic Sulfur (S₂)

Frederix¹,

Yang²,

Groenenboom³

et al. 2009

J. Phys. Chem. A

View full text Add to dashboard Cite

show abstract

“…Using LIF, the relative intensities of the satellites and the main branches emitted by the single pumped level can be measured. In this case such ratios led to some new and surprising information concerning the spin-spin interaction in the B-state (2), which had escaped notice in earlier conventional spectroscopic studies.…”

Section: Lif Experimentsmentioning

confidence: 89%

Laser-induced fluorescence in spectroscopy, dynamics, and diagnostics

Crosley¹

1982

J. Chem. Educ.

Self Cite

View full text Add to dashboard Cite

In the technique of laser-induced fluorescence, or LIF, a laser is tuned so that its frequency matches that of an ahsorption line of some atom or molecule of interest. The ahsorption of the laser photons by this species produces an electronicallv excited state which then radiates. The flnorescent emission i i decected using a filter or a monochromator followed hv a ~hotomt~ltiirlier. Because a l~arricular ahsorptiun line is selected, the excitkd state bas definite and identifiable vibrational. rotational, and fine structure quantum numbers. This cleanstate has significant advantages for spectroscopic and collision studies, in contrast to the congestion often found in ordinary emission spectra from, for example, a discharge. Since the lower state responsible for the absorption is also definite, considerable selectivity is provided by LIF when used as a diagnostic tool. In addition, its high degree of sensitivitv. the soatial and temooral resolution in non-laser spectroscopy, such as two photon excitation, yield new information and make oossihle new diagnostic probes. These features of LIF are;llustrated in th& paperming as examoles a variety of experiments conducted in the author's lahor&ies. LIF as a whole has had a tremendous impact on the study of the electronic spectra of small molecules,' and it should be noted that the experiments discussed here form but a tiny portion of the many ways LIF has been used to further our knowledge of molecular structure and hehavior. Nonetheless, it is hoped that the highly personalselection presented will serve to describe some of the important aspects of this exciting and rapidly progressing technique. LIF ExperimentsGiven a laser, the experimental config~ration employed for most LIF studies is quite simple. The laser beam is directed into a samole. which is contained in some suitable cell if necessary. ~h k flborescence emitted a t a right angle to the beam direction is focussed through a filter into a photoelectric detector. The filter may he a t a particular wavelength (such as a glass color filter or interference filter) or scannable (i.e., a monochromator).A single frequency laser (such as from a rare gas ion laser) mav be used if its freouencv hannens to coincide with that of some absorption ~ine,but ciear&a tunable (dye) laser is more versatile. It permits the performance of experiments on different molecules, or on a sequence of excited levels in one species so as to compare their hehavior. The most rapid growth in the number of LIF studies has coincided with the availability of commercial tunahle dye lasers. Continuous duty 1;tsers have ndwmtnyrs d much narrower linewidth and morc stahle otltput amplitudes, wherwi pulsed lasers have higher peak pow& and thus higher instantaneous signal levels, and with them is possible a variety of non-linear processes including frequency doubling and shifting methods. All of the experiments described in this paper involve pulsed lasers having repetition rates of typically 10 Hz, pulse lengths of 10 m a r or 1 usec. and in all but o...

show abstract

Rotational Satellite Intensities and Triplet Splitting in the B³Σ_u⁻ State of S₂

Cited by 23 publications

References 3 publications

Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system

Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system

Photodissociation Imaging of Diatomic Sulfur (S₂)

Laser-induced fluorescence in spectroscopy, dynamics, and diagnostics

Contact Info

Product

Resources

About

Rotational Satellite Intensities and Triplet Splitting in the B3Σu− State of S2

Cited by 23 publications

References 3 publications

Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system

Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system

Photodissociation Imaging of Diatomic Sulfur (S2)

Laser-induced fluorescence in spectroscopy, dynamics, and diagnostics

Contact Info

Product

Resources

About

Rotational Satellite Intensities and Triplet Splitting in the B³Σ_u⁻ State of S₂

Photodissociation Imaging of Diatomic Sulfur (S₂)