Fourier transform infrared emission spectra of MnH and MnD

An analysis of the rotational, fine and hyperfine effects in the (0,0) band of the A7Π–X7Σ+ transition of manganese monohydride, MnH

“…Similar to Ref. [5], the 4th order diagonal spin-spin interaction h was found to be negligible and ultimately constrained to zero. However, the spin distortion to the spin-rotation term c S was retained.…”

“…As expected, the parameters of Table 2 are, for the most part, quite similar to the values listed in Refs. [1,2,5] and the previous interpretation of the parameters is not altered. One exception is the spin-spin parameter, k, for the X 7 R + state, which in this work was determined as À0.004053(34) cm À1 , and which differs markedly from the value of À0.00325(10) cm À1 in Ref.…”

“…The primary goal was to achieve a model for the X 7 R + state that included all off-diagonal matrix elements, thus retaining all low-N data and accurately taking into account the previously noted internal hyperfine perturbations of Refs. [2,5].…”

“…Table 2 lists all the parameters determined in the final N 2 fit and using an operator form identical to the previous work fit along with their associated standard deviations, and those from Refs. [1,2,5] for comparison. It is important to note that a number of excited-state parameters are strongly correlated, in particular between T 00 , c, A D , and k, and also between B and D. The correlation matrix can be found in the supplemental material.…”

“…Recent studies include the identification of MnH via cavity ring-down spectroscopy in the laser vaporization of manganese in the presence of CH 4 [3], and the observation of vibrational transitions within the X 7 R + state of matrix isolated MnH [4]. Most recently Gordon et al [5] have recorded and analyzed the Fourier transform infrared emission spectra for the vibration-rotation bands from v = 1 fi 0 to v = 3 fi 2 bands of the X 7 R + state, where MnH was produced in a high-temperature discharge. They also noted that several low-N features could not be fit to within the experimental uncertainty and attributed the discrepancy to the internal hyperfine perturbations discussed in Refs.…”