High resolution spectroscopy on Te₂: New lines for reference.

Area of Science:

• Atomic and Molecular Spectroscopy
• Laser Physics
• Metrology

Background:

• Molecular ro-vibrational spectra serve as critical wavelength and frequency standards in precision experiments.
• Iodine and tellurium are common molecular standards, with tellurium widely used for short wavelengths (400-550 nm).
• Existing tellurium spectral atlases lack comprehensive data near 455 nm, a region with important atomic resonance lines.

Purpose of the Study:

• To investigate the tellurium spectrum in the 455 nm region.
• To identify new spectral lines for enhanced laser frequency stabilization.
• To expand the available data for molecular standards in the near-UV range.

Main Methods:

• High-resolution modulation transfer spectroscopy (MTS) was employed.
• Experiments were conducted on tellurium molecules within a hot cell.
• Spectral data were collected in the wavelength region around 455 nm.

Main Results:

• Over 100 previously unobserved spectral lines of tellurium were identified.
• The newly identified spectral lines exhibit narrow linewidths, on the order of tens of MHz.
• This expands the spectral database for tellurium in a critical wavelength range.

Conclusions:

• The newly discovered tellurium spectral lines are valuable for high-precision laser frequency locking.
• This research enhances the utility of tellurium as a molecular standard, particularly near 455 nm.
• The findings contribute to improved metrology and laser stabilization techniques.