RADIATIVE CHARACTERISTICS OF 3p Σ, Π; 3d Π~-, Δ~- STATES OF H_2 AND DETERMINATION OF GAS TEMPERATURE OF LOW PRESSURE HYDROGEN CONTAINING PLASMAS

摘要

For the first time semiempirical data on the radiative transition probabilities for rovibronic transitions between 3p Σ, Π; 3d Π~-, Δ~- and 2p Σ, Π states and radiative lifetimes of upper rovibronic levels of the hydrogen molecule were analysed in detail and presented in a table form useful for applications. The intensities of e~3 Σ_u~+, d~3 Π_u~± →a~3 Σ_g~+, i~3 Π_g~-, j~3Δ_g~- →c~3Π_u and I~1Π_g~-, J~1Δ_g~- →C~1Π_u band systems have been measured in d.c. capillary-arc and microwave discharges under pressures of 1-600 Pa and a power input of 1-500 W. It was observed, that recalculated for the ground X~1 Σ_g~+ vibronic state, values of rotational temperature, derived from the populations of e~3Σ_u~+, d~3Π_u~+ , d~3 Π_u~-, j~3Δ_g~- and J~1Δ_g~- states, coincide within 10-20% and may be used for plasma diagnostics. In contrast, the rotational population density distributions in I~1Π_g~- and i~3癬g~- states show abnormal behaviour corresponding to effective temperatures, which are about two times higher. The effect needs further investigations in crossed beams and gas-beam experiments.