EXPERIMENTAL AND THEORETICAL AUGER AND AUTOIONIZATION SPECTRA FOR ELECTRON-IMPACT ON LASER-EXCITED NA ATOMS

An experimental method is described to obtain electron spectra with go od resolution (Delta E = 40 meV) and high intensity following L-shell excitation or ionization of laser-excited Na atoms. We report on exper imental and theoretical electron spectra in the energy range of 25-33 eV for laser excitation to Na(3(2)P(1/2)), Na(3(2)P(3/2)), Na(5(2)S(1/ 2)) and Na(4(2)D(5/2)) and for 1.5 keV electron impact. Due to the goo d agreement in line positions and intensities essentially all lines ca n be assigned. Furthermore, experimental relative cross sections for N a(2p(5)3s(P-1,P-3)3pSLJ) states excited from Na(3(2)P(3/2)), Na(3(2)P( 1/2)) and Na(3(2)S(1/2)) are determined and compared with theoretical values.