New infrared transitions of solid parahydrogen in the spectral region 7900 - 9900 cm-1

In the author's most recent measurements of infrared transitions of solid parahydrogen with low ortho impurities, using a White-type external multireflection system for a sample path length of 38 cm, the authors have detected new extremely weak features in the spectral region 7900 - 9900 cm-1. Among them are the single transition (1) Y1left-arrow0(0) at 7991.85 (1) cm-1 and the double transitions (1) Q1left-arrow0(0) + Q1left-arrow0(0) at 8306.0 (1) cm-1 (2) U1left-arrow0(0) + Q1left-arrow0(1) at 9407.67 (5) cm-1 (3) Q1left-arrow0(0) + S1left-arrow0(0) at 9747.8 (1) cm-1 (4) U1left-arrow0(l) + Q1left-arrow0(0) at 9837.34 (5) cm-1. The Y1left-arrow0(0) transition is the second transition with ΔJ = 8 observed in a molecular spectrum after the Y0left-arrow0(0) transition and is even weaker than the latter by an appreciable factor. Intensity parameters will be reported for all of these transitions. The data were taken at a sample temperature of 12.3 K