Effect of vibrational excitation on the molecular beam reactions of Ca and Sr with HF and DF

Journal Article · Sat Apr 15 04:00:00 EST 1978 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.436242· OSTI ID:7208062

Karny, Z; Zare, R N

The reactions of Ca and Sr with HF and DF are studied using a beam-gas configuration as a function of reagent and product vibration to obtain state-to-state reaction rates. A beam of alkaline earth metal atoms enters a scattering chamber containing hydrogen fluoride. The HF and DF reagents are pumped from v=0 to v=1 by a pulsed HF or DF laser; the alkaline earth monofluoride products are detected by a pulsed tunable probe laser. The product internal state distribution is determined from the laser excitation spectrum. While no products could be detected for reactions with DF(v=1) or DF(v=0), the rate constant for the Ca and Sr reactions with HF(v=1) are both at least four orders of magnitude larger than the reactions with HF(v=0). The implications of these results on bond energies and the fate of the excess energy of reaction are discussed.

• Research Organization: Department of Chemistry, Stanford University, Stanford, California 94305
• OSTI ID: 7208062
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 68:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BEAMS
CALCIUM
CHEMICAL REACTION KINETICS
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
METALS
MOLECULAR BEAMS
MOLECULE COLLISIONS
REACTION KINETICS
STRONTIUM
VIBRATIONAL STATES