Rotational excitation and momentum transfer in slow positron-molecule collisions

作者: P G Coleman

DOI: 10.1088/0022-3700/14/14/021

关键词: Rotational transitionPhysicsMomentum transferPositronHomonuclear moleculeSpectral lineAtomic physicsAnnihilationExcitationThermalisation

摘要: Values of the energy-dependent cross sections for momentum transfer, annihilation and rotational excitation deexcitation positrons in N2, H2 D2 are chosen so that, when used a simple slowing-down calculation, forms recently measured lifetime spectra best reproduced. The success this procedure suggests essentially whole time taken thermalisation these gases, undergo collisions involving only or transfer. A reliable estimation two processes with energies below 0.5 eV homonuclear diatomic molecules should follow from application fuller theoretical analysis wider range experimental data.

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