INTENSITY BEATS IN RESONANCE RADIATION AND ABSORPTION DUE TO COHERENT EXCITATION OF ATOMS BY ELECTRON IMPACT.

RESONANCE ABSORPTION BEATS DUE TO COHERENT EXCITATION OF NONDEGENERATE METASTABLE ATOMIC SUBLEVELS BY ELECTRON IMPACT

INTENSITY BEATS IN RESONANCE RADIATION ABSORBED BY A COHERENTLY EXCITED METASTABLE STATE

COHERENT EXCITATION OF STATES BY ELECTRON IMPACT

ROLE OF INTERMEDIATE STATES IN EXCITATION OF ATOMS BY ELECTRON IMPACT.

EXCITATION OF ATOMS BY ELECTRONS AND BROADENING OF SPECTRAL LINES

RADIATION BY ATOMS IN RESONANT CAVITIES