Optogalvanic spectra of calcium in the 6090-6760 Å region

M. A. Khan; M. A. Gondal; M. H. Rais

doi:10.1007/BF00425996

Optogalvanic spectra of calcium in the 6090-6760 Å region

M. A. Khan^*, M. A. Gondal, M. H. Rais

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Optogalvanic spectra of some 30 transitions of calcium originating from the ground state as well as from several excited states (4s4p ^1,3P, 4s3d ^1,3D, 4s5p ³P, 3d4p ³D, ³F) have been investigated using laser-irradiation of a low-current glow discharge in a thermionic diode. The influence of various experimental parameters such as bias field, oven temperature and buffer gas pressure on the spectra are reported. Seven previously unreported transitions are recorded including four "forbidden" transitions which violate the J selection rules. An interesting anomaly observed in the non-statistical population of the 4s3d ³D_3,2,1 multiplet is discussed where the populations of ³D₃:³D₂:³D₁ are in the ratio of 94:5:1. A possible explanation is based on avoided crossing between potential energy curves of the Ca-Ar molecule.

Original language	English
Pages (from-to)	123-130
Number of pages	8
Journal	Applied Physics B Photophysics and Laser Chemistry
Volume	57
Issue number	2
DOIs	https://doi.org/10.1007/BF00425996
State	Published - Aug 1993

Keywords

32.80
34.80.DP
52.25
52.80

ASJC Scopus subject areas

General Engineering

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10.1007/BF00425996

Cite this

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title = "Optogalvanic spectra of calcium in the 6090-6760 {\AA} region",

abstract = "Optogalvanic spectra of some 30 transitions of calcium originating from the ground state as well as from several excited states (4s4p 1,3P, 4s3d 1,3D, 4s5p 3P, 3d4p 3D, 3F) have been investigated using laser-irradiation of a low-current glow discharge in a thermionic diode. The influence of various experimental parameters such as bias field, oven temperature and buffer gas pressure on the spectra are reported. Seven previously unreported transitions are recorded including four {"}forbidden{"} transitions which violate the J selection rules. An interesting anomaly observed in the non-statistical population of the 4s3d 3D3,2,1 multiplet is discussed where the populations of 3D3:3D2:3D1 are in the ratio of 94:5:1. A possible explanation is based on avoided crossing between potential energy curves of the Ca-Ar molecule.",

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year = "1993",

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doi = "10.1007/BF00425996",

language = "English",

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journal = "Applied Physics B Photophysics and Laser Chemistry",

issn = "0721-7269",

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TY - JOUR

T1 - Optogalvanic spectra of calcium in the 6090-6760 Å region

AU - Khan, M. A.

AU - Gondal, M. A.

AU - Rais, M. H.

PY - 1993/8

Y1 - 1993/8

N2 - Optogalvanic spectra of some 30 transitions of calcium originating from the ground state as well as from several excited states (4s4p 1,3P, 4s3d 1,3D, 4s5p 3P, 3d4p 3D, 3F) have been investigated using laser-irradiation of a low-current glow discharge in a thermionic diode. The influence of various experimental parameters such as bias field, oven temperature and buffer gas pressure on the spectra are reported. Seven previously unreported transitions are recorded including four "forbidden" transitions which violate the J selection rules. An interesting anomaly observed in the non-statistical population of the 4s3d 3D3,2,1 multiplet is discussed where the populations of 3D3:3D2:3D1 are in the ratio of 94:5:1. A possible explanation is based on avoided crossing between potential energy curves of the Ca-Ar molecule.

AB - Optogalvanic spectra of some 30 transitions of calcium originating from the ground state as well as from several excited states (4s4p 1,3P, 4s3d 1,3D, 4s5p 3P, 3d4p 3D, 3F) have been investigated using laser-irradiation of a low-current glow discharge in a thermionic diode. The influence of various experimental parameters such as bias field, oven temperature and buffer gas pressure on the spectra are reported. Seven previously unreported transitions are recorded including four "forbidden" transitions which violate the J selection rules. An interesting anomaly observed in the non-statistical population of the 4s3d 3D3,2,1 multiplet is discussed where the populations of 3D3:3D2:3D1 are in the ratio of 94:5:1. A possible explanation is based on avoided crossing between potential energy curves of the Ca-Ar molecule.

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JO - Applied Physics B Photophysics and Laser Chemistry

JF - Applied Physics B Photophysics and Laser Chemistry

IS - 2

ER -

Optogalvanic spectra of calcium in the 6090-6760 Å region

Abstract

Keywords

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