Abstract

The combination band of ν2 + 2ν3 of CH4 at 1.33 μm (7512 cm−1) was observed at 0.3-cm−1 resolution by a simple experimental arrangement using a near-infrared high-radiant InGaAsP light emitting diode (LED) and a Ge detector. Forty-six line centers were measured with accuracies of 0.03 cm−1. The assignment of these manifolds was made by inspection of the P, Q, and R branches. The experimental result indicates that the ν2 + 2ν3 band can be used for fully optical remote monitoring of methane using InGaAsP optical sources in conjunction with an ultralow-loss optical fiber network.

© 1983 Optical Society of America

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