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Use of a Fabry-Perot interferometer to isolate pure rotational Raman spectra of diatomic molecules

机译：使用Fabry-Perot干涉仪分离双原子分子的纯旋转拉曼光谱

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摘要

We propose to use a Fabry-Perot interferometer (FPI) as a comb frequency filter to isolate pore rotational Raman spectra (PRRS) of nitrogen molecules. In making the FPI's free spectral range equal to the spectral spacing between the lines of nitrogen PRRS, which are practically equidistant, one obtains a device with a comb transmission function with the same period. However, to match the FPI transmission comb completely with the comb of nitrogen PRRS lines one should tune the wavelength of the radiation used to excite thc PRRS of nitrogen exactly to thc position of any minimum in the FPI transmission comb. Thus to achieve this task for the case of nitrogen PRRS one must take thc FPI's free spectral range △v ＝ 4B_(N_(2)) and thc wavelength of thc exciting radiation such that (1/λ_(exc) ＝ 4B_(N_(2)) (k + 1/2), where B_(N_(2)) is the rotational constant of thc nitrogen molecule and k is an arbitrary integer number. In this case all (odd and even) pure rotational Raman lines of nitrogen will pass through the FPI while the line of exciting radiation is being suppressed. Additionally, a FPI cuts out thc spectrally continuous sky background light from thc spectral gaps between the PRRS lines.
机译：我们建议使用法布里-珀罗干涉仪（FPI）作为梳状频率滤波器来隔离氮分子的孔旋转拉曼光谱（PRRS）。通过使FPI的自由光谱范围等于实际上是等距的氮PRRS线之间的光谱间隔，可以获得具有相同周期的梳状传输功能的装置。但是，为了使FPI传输梳与氮PRRS线梳完全匹配，应将用于激发氮PRRS的辐射波长精确地调整到FPI传输梳中任何最小值的位置。因此，要在氮PRRS的情况下实现这一任务，必须考虑FPI的自由光谱范围△v ＝ 4B_（N_（2））和激发辐射的波长，使得（1 /λ_（exc）＝ 4B_（N_（ 2））（k + 1/2），其中B_（N_（2））是氮分子的旋转常数，k是任意整数，在这种情况下，所有（奇数和偶数）纯氮旋转拉曼线FPI会通过FPI，而激发辐射线被抑制;此外，FPI会从PRRS线之间的光谱间隙中切出光谱连续的天空背景光。

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