Intracavity spectroscopy of high-temperature water vapor in the region of 1.06 μm

Abstract

The absorption spectrum of water vapor is studied in the region of 9375–9460 cm−1 and at temperatures within 300–1200 K using an intracavity laser spectrometer based on a Nd laser having a threshold absorption sensitivity of 10−8 cm−1. More than 270 absorption lines are detected in the high-temperature spectrum of water vapor, 70% of which are assigned to ten vibrational bands: 3ν2 + ν3, 2ν1 + ν2, ν1 + ν2 + ν3, ν2 + 2ν3, ν1 + 3ν2, 3ν3 − ν2, 2ν2 + 2ν3 − ν2, ν1 + 2ν2 + ν3 − ν2, 2ν1 + ν3 − ν2, and ν2 + 3ν3 − 2ν2. The vibrational-rotational energy levels are determined.