22541-56-6Relevant academic research and scientific papers
State-specific reactions HBr+(2IIi, v+) + (H2, HBr) → H2Br+ at low collisional energies
Belikov,Mullen,Smith
, p. 6625 - 6630 (2001)
The rate coefficients for hydrogen atom transfer reactions between (H2,HBr) molecules and the HBr+ ions were measured in a state-specific manner under low collisional and rotational energy of reactants in a free jet. Selected spin-orbit and vibrational states of the HBr+ ions with narrow rotational distribution were prepared using (2+1) REMPI. All ions (reactants and products) were measured by TOF mass spectrometry. Finally, the resulting data was analyzed in detail.
State-specific low temperature reactions (HBr+, DBr +) [2 Πi,v ] + (H2, D 2): Channels and rates
Belikov, Andrey E.,Smith, Mark A.
, p. 7 - 11 (2004)
The channels of the HBr+(Πi,v)+D2 and DBr+(Πi,v)+H2 ion-molecule reactions were investigated in a state-selective manner at low temperatures in a free jet. The selected spin-orbit and vibrational states of the ions were prepared by resonance-enhanced multiphoton ionisation. All three energetically accessible channels of the reactions were under consideration using time-of-flight mass spectrometry. The dependence of the rate coefficient of the atom transfer channel versus reaction energy appears to be common to all ion-molecule pairs studied here and previously: HBr++H2, HBr ++D2, DBr++H2, DBr ++D2.
Low-temperature Kinetics of the Charge- and Atom-Transfer Reactions (Br+, HBr+ [2∏i, ν+, DBr+ [2∏i, ν+]) + (HBr, DBr) → (HBr+, DBr+, H2Br +, D2Br+, HDBr+)
Belikov, Andrey E.,Smith, Mark A.
, p. 3447 - 3456 (2007/10/03)
The charge- and atom-transfer reactions between Br+, HBr +, and DBr+ ions and HBr and DBr molecules have been studied in a HBr + DBr + He free jet. The ionic reactants in specific internal states were prepared by resonance multiphoton ionization of either HBr or DBr, and the ionic products were analyzed by mass spectrometry. A set of eight energetically possible reactions was considered in each case, including ions born in near-resonant ionization and photodissociation processes. Kinetic equations were integrated numerically over the appropriate reaction time and an optimization problem was solved to determine rate coefficients fit to final fractions of all ions measured in an experiment. Analytical expressions for the final fractions also were obtained and were used to derive the rate coefficients more accurately. The work is an example of a multireaction study without direct observation of all the reaction products.
State-specific low temperature reactions of DBr+2 i(v+) + (D2, DBr) → D2Br+
Belikov, Andrey E.,Smith, Mark A.
, p. 57 - 63 (2008/10/08)
State-specific reactions of DBr+(2 i, v+) with D2 and DBr were studied in a low temperature free jet flow reactor. The selected spin-orbit and vibrational states of the DBr+ ion were prepared by resonance-enhanced multiphoton ionization. All of the reactant and product ions were monitored using time-of-flight mass spectrometry. Rate coefficients for the DBr+/DBr reaction are ～1.4 × 10-9 cm3 s-1 independent of the ion internal state, similar to those for the HBr+/HBr reaction. Rate coefficients of the DBr+/D2 reaction rise from 0 (lower spin-orbit-vibrational states) to 2 × 10-11 cm3 s-1 (highest energy states) and are observed to follow a mass independent threshold function similar to the HBr+/H2 reaction.
