使用可调谐红外二极管激光器对甲醛的ν(5)带进行高分辨率光谱测量。

High resolution spectral measurements in the nu(5) band of formaldehyde using a tunable IR diode laser.

作者信息

Cline D S, Varghese P L

出版信息

Appl Opt. 1988 Aug 1;27(15):3219-24. doi: 10.1364/AO.27.003219.

DOI:10.1364/AO.27.003219

PMID:20531921

Abstract

Line strengths and broadening coefficients for formaldehyde (H(2)CO) near 3.5 microm were measured at room temperature using a tunable IR diode laser. Because of the extremely narrow linewidth of the laser ( approximately 10(-3) cm(-1)), the transitions were recorded at a resolution limited only by collision and Doppler broadening. The spectral parameters were determined from Voigt line shape fits to R and Q branch rotational-vibrational transitions of the nu(5) band between 2867 and 2881 cm(-1). Line strength measurements were made on both pure and dilute samples of H(2)CO. Pressure broadening of H(2)CO lines by N(2) was measured in mixtures containing 0.8-1.2% H(2)CO.

摘要

在室温下使用可调谐红外二极管激光器测量了3.5微米附近甲醛（H₂CO）的谱线强度和展宽系数。由于激光的线宽极窄（约10⁻³厘米⁻¹），跃迁记录的分辨率仅受碰撞展宽和多普勒展宽限制。光谱参数由对2867至2881厘米⁻¹之间ν₅带的R和Q支转动 - 振动跃迁的沃伊特线型拟合确定。对纯H₂CO样品和稀释样品都进行了谱线强度测量。在含有0.8 - 1.2% H₂CO的混合物中测量了N₂对H₂CO谱线的压力展宽。