High resolution isotope shifts and hyperfine structure measurements of tungsten by laser induced fluorescence spectroscopy

TL;DR

This study employs laser induced fluorescence spectroscopy to precisely measure isotope shifts and hyperfine structures in tungsten, providing new data and improved nuclear parameters for specific electronic transitions.

Contribution

The paper reports the first measurements of isotope shifts for the 384.9 nm transition and enhances the precision of existing isotope shift data for tungsten's spectral lines.

Findings

First isotope shift measurements for 384.9 nm transition

Higher precision isotope shifts for 400.9 nm and 407.4 nm transitions

New magnetic hyperfine constants for specific tungsten states

Abstract

Isotope shifts and hyperfine structure of tungsten were studied in the near UV range. We have used laser induced fluorescence spectroscopy on a pulsed supersonic beam to probe the 5D0 -> 5F1 transition at 384.9 nm, 7S3 -> 7P4 transition at 400.9 nm, and 7S3 -> 7P3 transition at 407.4 nm. Three new magnetic hyperfine constants are reported for 7P3,7P4, and 5F1 states. The isotope shifts of the 384.9 nm transition are presented for the first time, and the isotope shifts of 400.9 nm and 407.4 nm transition are measured with an order of magnitude higher precision compared to the previous measurements. As a result, the nuclear parameters lambda and lambda_{rel} are extracted from the isotope shifts with an improved precision.