Vibrational transition moment of the CH radical determined from the Herman-Wallis effect

The Delta upsilon = 1 emission spectrum of the CH radical was observed by a Fourier transform spectrometer. The Herman-Wallis effect observed as inten sity difference in P- and R-branch transitions was analyzed to give the tra nsition dipole moment, where we used a new method to calculate intensities of vibration-rotation spectral lines with wave functions obtained by the di agonalization of a vibration-rotation energy matrix up to upsilon = 40. Whe n the permanent dipole moment of 1.46 D was used, the vibrational transitio n moment mu(10) was determined to be -0.151(10) D, with 1 standard deviatio n in parentheses.