ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The B2 H5 radical has been generated by the F+B2 H6 reaction, and studied by photoionization mass spectrometry. The photoion yield curve for B2H+5 (B2 H5 ) is extremely weak at the adiabatic threshold (∼6.945 eV), at least three orders of magnitude weaker than at its maximum (∼9.67 eV). This observation provides support for recent ab initio calculations, which predict a singly bridged B2 H5 and a triply bridged B2H+5 as ground states. Evidence is presented for the coexistence of a doubly bridged B2 H5 isomer, ∼3 kcal/mol higher in energy. From the appearance potential of B2H+3 (B2 H5 ), a B2 H5 –H bond energy of (approximately-less-than)102.7 kcal/mol is obtained. From the photoion yield curve of B2H+3 (B2 H5 ), at least one, and perhaps two, excited states of B2H+5 can be inferred. The lower one also branches into parent B2 H5, an apparent violation of QET.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.456795
