New series of satellite peaks associating with the ν3 band of CH3F-(ortho-H2)n clusters in solid para-H2 studied by high resolution quantum cascade laser spectroscopy

New satellite series were found to the lower energy side of each main peak of the nu(3) band of CH3F embedded in a para-H-2 crystal. All the peaks showed a common red shouldered line profile, which corresponds to partly resolved transitions of ortho- and para-CH3F. The spectral pattern and time behavior of the peaks may suggest that these satellite series originate from a family of CH3F clusters involving ortho-H-2 in second nearest neighbor sites. A model function assuming this idea is used to resolve the observed spectrum into each Lorentzian component, and then the detailed features of these series are studied. The peak intervals in the series are not as equally spaced as the main series, but there is a strong resemblance among the satellite series. The peak intensity distribution in the series showed an irregular pattern rather than statistically smooth one, but there is a strong resemblance among the satellite series with the common feature in which the third peak is strongest. The linewidths are similar among each series. However, the amount of the peak shift seems too small, considering the distance of ortho-H-2 at a second nearest neighbor site. (C) 2015 Elsevier Inc. All rights reserved.