Measurement of the spin-exchange cross section in the collision of H atoms withO2and NO by means of stored atomic-beam spectroscopy

Abinitiopotential-energy surfaces and electron-spin-exchange cross sections for H-O2interactions

“…5. The value from the most recent roomtemperature measurements by Anderle et al [42] agrees well with the result from our work. The lowest-temperature measurement of Gordon et al [41] also agrees well with present results; on the other hand, the higher-temperature data fall off more rapidly [more like the T -1/3 low-temperature extrapolation expected from trsF(E) with the energy dependence of Eq.…”

“…where K is the Boltzmann constant and T is the kinetic tem- We also compare the present results with measured data [40][41][42] using the corrections of Turner, Snider, and Fleming [10] in Fig. 5.…”

Muonium atom spin exchange with alkali-metal vapors: Mu+Cs

“…It is not only amenable to theoretical calculations in that it can be viewed as a quasielastic scattering process, but it is also important in many branches of chemistry and physics such as optical pumping, masers, plasmas, and astrophysics. Electron-spin exchange has been studied experimentally in many H-atom systems in the gas phase, such as H-H [3 -6], H-Oz and H-NO [4,7,8], Mu-Oz and Mu-NO [9ll], H-A [12 -15], as well as A-A [16 -19], utilizing techniques such as masers, electron-spin resonance (ESR), microwave absorption, optical pumping, and muon spin rotation (pSR). Here Mu refers to the atomic bound states of a positive muon and an electron, the muonium atom (Mu = p+e ), and A represents an alkali-metal atom.…”

“…To our knowledge, there are no reported studies to date of any H-atom isotope effects in spin exchange other than the comparisons between H [4,7,8] and Mu [9 -11] spin exchange with 02 and NO rnolecules. Studies of H (D) with A are reportedly underway [12,13], but here the mass difference is only a factor of 2.…”