Electron-impact excitation of argon: I. The 4s '[1/2](1), 4p[1/2](1) and 4p '[1/2](0) states

摘要

We present absolute normalized differential cross sections (DCSs) for electron-impact excitation of the three individual electronic states of at argon: 4s'[1.2](1), 4p[1/2](1) and 4p'[1/2](0). The measurements were performed with incident electron energies of 16, 20, 30, 40, 50 and 80 eV, scattering angles between 5 degrees and 150 degrees and an angular resolution of better than 2 degrees. The absolute scare for the reference state (4s'[1/2](1)) was established by experimental determination of inelastic to-elastic intensity ratios for the 4s'[1/2](1) state at the above impact energies. Absolute inelastic DCSs for the other two states were determined using the intensity ratios of the peaks in the energy-loss spectra. The absolute DCSs were extrapolated to 0(degrees) and 180 degrees and integrated numerically to yield integral, momentum transfer and viscosity cross sections. [References: 30]