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

Abstract

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.