Fig. 1
Wavelength range used for the present study where the ν3 asymmetric C-H stretching vibration band of CH4 is located. ACS spectral coverage is shown for indication with a discretization into spectral segments corresponding to the diffraction orders sampled by the grating position 12 set-up. TheQ-branch, which comprises the densest portion of the band, is located in orders 179 and 180 whereas the most intense lines of the ν3 transition can be found in the R-branch and are sampled by order 182.
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