A physically intuitive non-resonant local mode axis tilting model for
the interpretation of higher overtone bands of XH2 species is outlined
and illustrated by reference to the near-infrared of spectrum H2S. Qu
antitative connections with the conventional normal mode resonance cou
pled picture are derived and local mode based expressions for the vibr
ational-rotational wavefunctions are given. Constants are reported for
the (311)-(212) and (302)-(203) bands at 11 008 cm(-1) and 12 149 cm(
-1), respectively.