780 nm处甲烷的二极管laser泛频光谱
Diode laser overtone spectroscopy of methane at 780 nm
摘要：
用可调谐半导体激光光谱仪研究了室温下$^{12}$ CH $_4$在12780 cm $^{-1}$（780 nm）附近的泛音吸收谱线。光谱仪源是以“自由运行”模式操作的市售可调谐二极管激光器。通过使用波长调制光谱学和允许观察$\approx 10^{-6}$量级的最小光学振幅的二次谐波检测技术，可以测量0.01 cm $^{-1}$内的线位置。观测到的最弱谱线的吸收截面为$1 \times 10^{-25}$ cm $^2$ /分子，即$\simeq 0.3$ km $^{-1}$ /amagat。对其中的一些，得到了自、空气、He和H $_2$的展宽系数。
英文摘要：
A tunable diode laser spectrometer has been employed to examine the overtone absorption lines of $^{12}$CH$_4$ in the region around 12780 cm$^{-1}$ (780 nm) at room temperature. The spectrometer sources are commercially available tunable diode lasers operating in "free-running" mode. The measurement of the line positions within 0.01 cm$^{-1}$ has been possible by the use of the wavelength modulation spectroscopy and the second harmonic detection techniques that permitted the observation of minimum optical absorbances of the order of $\approx 10^{-6}$. The weakest observed lines of the band have absorption cross sections of the order of $1 \times 10^{-25}$ cm$^2$/molecule, that is $\simeq 0.3$ km$^{-1}$/amagat. For some of them self-, air-, He- and H$_2$-broadening coefficients have been obtained.
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