A kinetic model of an optically pumped lithium plasma is discussed. Observations of ionization processes at high Rydberg atom density are analyzed, and the role of an electron avalanche process is identified. The optical pump intensity requirements for continuous plasma formation are derived, and Li production is modeled. Keywords: Negative ions: Lithium: Optical plasma. (jhd)
We examine the feasibility of an opening switch concept based on magnetic insulation in a coaxial thermionic diode. It is found that the impedance ratio between 'closed' and 'open' states of the diode is marginal for efficient energy transfer via this type of switch. The open, or insulated state of the diode is characterized by current leakage across the magnetic field which is associated with the presence of plasma waves. ...
The first experimental observations of dissociative attachment in lithium dimmer molecules are presented, Lithium molecules are optically pumped via the Li2(B) electronic state into selected levels of the ground electronic state. Low energy electrons are created by two-step laser photoionization of lithium atoms. Product Li ions are detected by time-of-flight spectrometry. Preliminary analysis of the data gives a rate constant of .3 x 10 to the 8th power cc/sec for ...
An experimental and theoretical study of titanium alloy foil windows is described. The alloys considered are Ti 15-3-3-3, Ti 3-2.5, and CP Ti(4). The foil thickness ranges from 0.5 mil to 1.0 mil. Tensile strength data is presented for 75 deg F and 600 deg F. High-cycle 10 to the 7th power fatigue data is presented for Ti 15-3-3 and Ti 3-2.5 at 75 deg F and 600 deg F. ...
An experimental and theoretical study of titanium alloy foil windows is described. The alloys considered are Ti 15-3-3-3, Ti 3-2.5, and CP Ti(4). The foil thickness ranges from 0.5 mil to 1.0 mil. Tensile strength data is presented for 75 F and 600 F. High-cycle (10 to the 7th power) fatigue data is presented to Ti 15-3-3-3 and Ti 3-2.5 at 75 F and 600 F. Crystal structures are shown ...
An experimental and theoretical program has been completed which thoroughly characterizes the e-beam sustained discharge HgBr laser. The preliminary design of a 100 Hz, 2 J HgBr laser has been performed. From measurements of HgBr fluorescence efficiency as a function of E/N the primary laser excitation process has been identified as the collisional excitation of HgBr2 by electrons. A self-consistent set of excitation cross sections is derived from the experiment. ...
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