Atomic sulphur lines from above the first ionisation limit

Alder, John F.; Bombelka, R.M.; Kirkbright, G.F.

doi:10.1088/0022-3700/11/2/008

Cited by 13 publications

(1 citation statement)

References 9 publications

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“…However, Gibson et al also noted that radiative transitions from the 3d term could influence the intensity ratio if radiative decay is more important for 3d than for 4d. In fact Alder et al (1978) have observed emission lines from the term identified as 3d and Joshi et a1 who measured the total absorption, instead of the autoionization yield, give the 3d absorption as being somewhat stronger than the 4d absorption. This is in agreement both with the present calculation and with that due to Froese Fischer (1987).…”

Section: Wementioning

confidence: 97%

Calculations of strong interactions between a perturber and one or several series using B-spline basis sets

Landtman¹,

Hansen²

1993

J. Phys. B: At. Mol. Opt. Phys.

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We use B-spline basis sets to consider the influence of complete series (i.e. discrete states + continuum) on a perturber. In particular we calculate the interaction between the nsnp6 2 S term and the ns2np4(1D)md/ epsilon d2S Rydberg series in Ar II (n = 3) and Kr II(n = 4) and between the 3s3p5 3 P term and the 3p3(2D)nd/ epsilon d3P, 3p3(2P)nd/ epsilon d3P and 3p3(2P)ns/ epsilon s 3p Rydberg series in S I. Energies and eigenvectors are calculated for the lower part of the bound spectrum. In Ar II and Kr II, we use these to calculate the strength of the satellite spectrum following 3s ionization in Ar and 4s ionization in Kr. In the case of S I we calculate oscillator strengths for transitions to the ground state and discuss the identification of the observed photoabsorption spectra. The results are compared with other theoretical calculations and with experimental results. We discuss the determination of the B-spline basis as a solution to the frozen core HF equations. We show that use of a rather limited B-spline basis is a very efficient way to approximate a complete (bound + continuum) Rydberg series.

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Section: Wementioning

confidence: 97%

Calculations of strong interactions between a perturber and one or several series using B-spline basis sets

Landtman¹,

Hansen²

1993

J. Phys. B: At. Mol. Opt. Phys.

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Single-photon spectroscopy of singlet sulfur atoms and the autoionization lifetime measurements of the superexcited singlet states

Huang

Stuchebrukhov

et al. 2005

The Journal of Chemical Physics

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Single-photon excitation spectra from the lowest singlet (1)D(2) level of sulfur atoms were recorded with a tunable vacuum ultraviolet (VUV) radiation source generated by frequency tripling in noble gases. The photolysis of CS(2) at 193 nm was used to produce the singlet S((1)D(2)) sulfur atoms that were then excited to neutral superexcited states with the tunable VUV radiation. These superexcited states undergo autoionization into the first ionization continuum state of S(+)((4)S(3/2) (o))+e(-), which is not directly accessible from the S((1)D(2)) state via an allowed transition. The excitation spectra were recorded by monitoring the S(+) signal in a velocity imaging apparatus while scanning the VUV excitation wavelength. Three new lines were observed in the spectra which have not been previously reported. The full widths at half maximum (FWHM) of each of the observed transitions were determined by fitting the profiles of each absorption resonances with the Fano formula. Autoionization lifetimes tau of these singlet superexcited states were obtained from FWHM using the Uncertainty Principle. Abnormal autoionization lifetimes were found for the 3s(2)3p(3)((2)D(o))nd((1)D(2)) and the 3s(2)3p(3)((2)D(o))ns((1)D(2)) Rydberg series, in which tau(5d) and tau(7s) are shorter than tau(4d) and tau(6s), respectively. This is contrary to the well-known scaling law of tau(n*) proportional, variantn(*3), which should be followed within a series unless there exist perturbations from other series or new channels open up to which some members of the series can decay. Possible perturbations from the nearby triplet series are suspected for causing the broadening of the 5d and 7s levels.

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The production and spectroscopy of excited sulfur atoms from the two-photon dissociation of H2S

Steadman

Baer

1988

The Journal of Chemical Physics

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Ground (3PJ) and excited state (1D2, 1S0) sulfur atoms have been produced by the two-photon photodissociation of H2S in the wavelength range 285–316 nm. The resultant sulfur atoms undergo 2+1 resonance enhanced multiphoton ionization (REMPI) at selected laser wavelengths. The initial and final ion states in the 2+1 REMPI process have been determined through the analyses of the REMPI spectrum (laser wavelength scan) and the REMPI-PES taken at the atomic resonances. The intermediate states accessed in the two-photon excitations have been assigned. Several transitions which originate from the 1S0 excited state of atomic sulfur have been observed. The intermediate states of these transitions lie above the ionization continuum and are depleted competitively by autoionization and further photon absorption. Extremely pure state selection of ground and excited sulfur atomic ions is demonstrated at several of the two-photon resonances. Evidence of configuration interaction between the 6p 3P1, 6p 5P1, and 4p 1P1 levels is presented.

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Atomic sulphur lines from above the first ionisation limit

Cited by 13 publications

References 9 publications

Calculations of strong interactions between a perturber and one or several series using B-spline basis sets

Calculations of strong interactions between a perturber and one or several series using B-spline basis sets

Single-photon spectroscopy of singlet sulfur atoms and the autoionization lifetime measurements of the superexcited singlet states

The production and spectroscopy of excited sulfur atoms from the two-photon dissociation of H2S

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