Ultraviolet laser spectroscopy of aluminum atoms in hollow-cathode lamp

TL;DR

This paper presents precise measurements of aluminum atomic transitions at 394 nm and 396 nm in a hollow-cathode lamp using absorption and saturated absorption spectroscopy, including hyperfine structure constants and frequency calibration.

Contribution

It provides new high-precision measurements of aluminum atomic transition frequencies and hyperfine constants, with analysis of Doppler linewidth and velocity-changing effects.

Findings

Measured transition frequencies with high accuracy

Determined hyperfine structure constants of aluminum

Compared experimental results with theoretical calculations

Abstract

We report precision measurement of aluminum atoms ${^{2}P_{1/2}}-{^{2}S_{1/2}}$ transition at 394 nm and ${^{2}P_{3/2}}-{^{2}S_{1/2}}$ transition at 396 nm in a hollow-cathode lamp (HCL). Both absorption spectroscopy and saturated absorption spectroscopy (SAS) are performed. From the absorption spectroscopy the Doppler linewidth is estimated to be 2.6 GHz. The SAS spectroscopy is analyzed based on the velocity-changing-effect model. With a frequency comb calibrated wavemeter, the frequencies of ${^{2}P_{1/2}},{F=3}-{^{2}S_{1/2}},{F=2}$ transition and ${^{2}P_{3/2}},{F=4}-{^{2}S_{1/2}},{F=3}$ transition are measured to be 759.905401(10) THz and 756.547403(10) THz, respectively. The hyperfine structure constants of aluminum atoms are determined and compared with previously reported measurement results and theoretical calculation. Reasonable agreement is found for the magnetic dipole constant (A constant), while the electric quadrupole constant (B constant) has a large deviation.