Laser spectroscopic measurement of isotope shifts of transitions 3d-4p in the ionic spectra of argon, chlorine and sulphur

Abstract

By means of collinear laser spectroscopy at ion beams of Ar +, S + and CI + the isotope shifts of a total of twelve lines could be measured. All the lines are of the type 3p "--~ 3d-~3p"-~4p (3p" being the proper ground configuration of the ions). All the measured shifts are unusually large and prevailingly due to a strong specific mass effect or momentum correlation of the 3d electron with the inner p-shells. The measured shifts could be quantitatively reproduced by computation of the inherent Vinti integrals.

Isotope Shifts in Atomic Spectra

“…The large size of the specific mass shift is discussed, for the similar case of argon, in Section 9.18. Eichhorn et al (1982) (see Section 9.16) found the specific mass shift for 37 • 35 Cl in 3p 3 ( 4 S)3d 5 D 4 -3p 3 ( 4 S)4p 5 P 3 of Cl II was -2589(28) MHz on the assumption that the field shift was negligible, this was in fair agreement with their theoretical evaluated value of -2925 MHz.…”

“…Natural sulphur is 95% 32 S and Schaller et al (1978) found from measurements of muonic x-ray transition energies that (r 2 ), the mean square radius of the nuclear charge distribution, of the natural mixture of isotopes is 10.65(1) fm 2 • The isotope shift for 34 • 32 S has been measured in the optical transition 3p 2 eP)3d 4 F 912 -3p 2 eP)4p 4 D 712 of S II by Eichhorn et al (1982). Resonance absorption between an ion beam of sulphur and a cw dye laser was detected by observing the fluorescence.…”

“…It is the latter which is the relevant quantity so far as spectral resolution is concerned, and so isotope shifts can be measured accurately in ions and highly excited atoms. Examples of this type of experiment are the measurement of isotope shifts in Ba II by with an uncertainty of about 300 KHz, in Rb I by Klempt et al (1979) with an uncertainty of about 8 MHz between radioactive isotopes, and in Ar II, Cl II, and S II by Eichhorn et al (1982) with an uncertainty of about 15 MHz.…”

Isotope shifts and hyperfine-structure-splitting constants of the 4d-5ptransition of Kr ii at λ=729 nm

“…This feature, namely, the predominance of the SMS contribution to the total IS in a p-d transition in Kr II, has also been observed in the ionic spectra of two other noble gases, Ar [20] and Xe [21].…”

“…Analogous d-p transitions in the ionic spectra of other noble gases were investigated in Ar [20] and Xe [21,22].…”