Schlemmer, Parise, Glosik, Gerlich, ....
Observational
Facts
strong enhancement of H2D+/H3+, many other deuterated
species, multiply deuterated species
Basic principle of Deuterium Fractionation: Differences in ZPE =>
thermodynamic predictions
H3+, CH3+, C2H2+ as THE examples => very strong temperature dependence
Experimental Facts
gas phase / ices
Deuterium enrichment in the laboratory (techniques, results: H2D+ and other
molecules)
The Role of o-H2: scrambling collisions, o/p conversion, heating effects,
the role of nuclear spin conservation
Theoretical Approaches
thermal rate coefficients,
rates for o/p conversion
state specific rate coefficients
non-thermal effects (detailled
balance, steady state)
nuclear spin restrictions
dynamical effects potential energy surface
systematic experiments
temperature dependence, o/p H2 dependence, determination of HD/H2 ratio
(freeze out in experiments), independent determinations of o/p ratio of H2 (N+,hydrogen cluster ions, Raman scattering,...
state selective experiments
Comparison to theory:
microcanonical treatment, treatments beyond statistical approach if necessary
(dynamics)
Observations:
determination of o/p ratio of H2D+ in same
source, detection of first excited state of H2D+ (110), further detections of
D2H+ states, detection of CH2D+, ....