“…The BiH absorptions at 1635.9, 1622.7, and 1621.9 cm -1 in solid neon, hydrogen, and argon, respectively, exhibit 1.395, 1.395, and 1.396 BiH/BiD ratios, which are almost identical to the 1.394 ratio found for the gas-phase 1635.7 cm -1 vibrational fundamental. − Again, note that the neon matrix value is slightly higher and the hydrogen and argon matrix values are slightly lower than the gas-phase observation. Although the BiH and BiD bands are invariant with the H 2 + D 2 , and HD reagents in neon and argon matrixes, and BiD is invariant in D 2 and H 2 + D 2 samples, the BiH bands are perturbed by the solid normal hydrogen (ortho and para) matrix environment.…”