Spectroscopy and Laser Applications

Spectroscopy in this corner of chemistry is concerned with how molecules absorb, emit, or scatter light at specific frequencies, and with using that fingerprint behavior to identify and quantify gases with high precision. Researchers build and maintain large spectroscopic databases—such as HITRAN and HITEMP—that catalog the absorption lines of thousands of molecular species, providing the reference data needed for everything from atmospheric remote sensing to industrial process monitoring. Laser-based techniques, including quantum cascade lasers operating in the infrared and terahertz ranges, photoacoustic detection, and cavity ring-down spectroscopy, have pushed sensitivity to the point where trace gases at parts-per-trillion concentrations can be measured in real time, opening up applications in medical breath analysis and combustion diagnostics. Active challenges include extending database coverage to high-temperature conditions where molecular spectra grow far more complex, and developing compact, fieldable laser systems—such as frequency comb sources—that can perform broadband, simultaneous multispecies detection outside the laboratory.

Works

109,906

Total citations

1,464,750

Keywords

Spectroscopic DatabasesTerahertz Quantum-Cascade LasersInfrared Laser AbsorptionGas SensingPhotoacoustic SpectroscopyHigh-Temperature Molecular Spectroscopy