Wavenumber Measurement of the 1.5-µm Band of Acetylene by Semiconductor Laser Spectrometer

Near-infrared distributed feedback (DFB) semiconductor laser spectroscopy of acetylene has been carried out from 6450 to 6570 cm-1 with an accuracy of about 0.0033 cm-1. The molecular constants of the (1010000)–(0000000), (1011100)–(0001100), and (1010011)–(0000011) bands of 12C2H2 and the (1010000)–(0000000) and (0020000)–(0000000) bands of 12C13CH2 have been precisely determined. The transition frequencies calculated from the constants can be used as references for optical communication systems.