Diode laser spectroscopy of overtone bands of acetylene

Year: 1996

Authors: Lucchesini A., De Rosa M., Pelliccia D., Ciucci A., Gabbanini C., Gozzini S.

Autors Affiliation: Ist. Fis. Atomica e Molec. del CNR, Via del Giardino, 7 I-56127 Pisa, Italy

Abstract: Overtone absorption lines of acetylene in the regions around 12700 and 11800 cm(-1) have been examined by the use of tunable diode lasers in free-running mode. The diode laser emission wavelength was scanned around the gas resonances by simply sweeping its injection current, permitting a direct observation of the absorption line-shapes. Weak overtone absorption lines have been detected by using the wavelength modulation (WM) spectroscopy with 2(nd) harmonic detection technique and the collisional broadening and shift coefficients have been obtained. The high resolving power and accuracy of the spectrometer permitted a wavenumber error of less than 0.01 cm(-1). The correct interpretation of the absorption signals when detecting the second harmonic in the presence of a sloping background is discussed.


Volume: 63 (3)      Pages from: 277  to: 282

KeyWords: Acetylene; Band structure; Electromagnetic wave emission; Laser tuning; Light absorption; Optical resolving power; Second harmonic generation; Semiconductor lasers; Spectrometers, Collisional broadening; Diode laser emission wavelength; Diode laser spectroscopy; Gas resonances; Injection current; Overtone bands; Shift coefficients; Wavelength modulation spectroscopy, Spectroscopy

Citations: 34
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