6,744 research outputs found
Sealed cabinetry Patent
Sealed housing for protecting electronic equipment against electromagnetic interferenc
Electron energy analyzer
Electrostatic deflection analyzer with three spherically concentric grids allows production of electrons within a small volume at the center of the inner sphere. By applying a retarding potential between the middle and inner spheres, the energies of the electrons can be measured
Studies of photoabsorption by atomic hydrogen, oxygen, and nitrogen
Quantitative measurement of atomic photoionization cross sections of atomic hydrogen, oxygen, and nitroge
Dissociative and double photoionization of CO2 from threshold to 90 A
The molecular photoionization, dissociative photoionization and double photoionization cross sections for CO2 were measured from their onsets down to 90 A by using various combinations of mass spectrometers (a coincidence time-of-flight mass spectrometer and a magnetic mass spectrometer) and light sources (synchrotron radiation, and glow and spark discharge). It is concluded that the one broad peak and the three shoulders in the total adsorption cross section curve between 640 and 90 A are caused completely by dissociative ionization processes. Several peaks observed in the cross section curve for the total fragmentation CO(+)3, O(+) and C(+) are compared with those in the photoelectron spectrum reported for CO2
Absolute photoionization cross sections of atomic oxygen
The absolute values of photoionization cross sections of atomic oxygen were measured from the ionization threshold to 120 A. An auto-ionizing resonance belonging to the 2S2P4(4P)3P(3Do, 3So) transition was observed at 479.43 A and another line at 389.97 A. The experimental data is in excellent agreement with rigorous close-coupling calculations that include electron correlations in both the initial and final states
Absorption cross sections of minor constituents in planetary atmospheres from 1050 to 2100 angstrom
Absorption cross sections of minor constituent gases in planetary atmospheres from 1050 to 2100
On the ionization potential of molecular oxygen
The ionization potential of O2 was measured by the technique of high resolution photoelectron spectroscopy taking into account the influence of rotational structure on the shape of the vibrational bands. A value of 12.071 + or - .001 eV (1027.1 + or - 0.1 A) was found for the ionization potential. A lowering of the ionization potential caused by a branch-head when delta N = -2 gave an appearance potential for ionization of 12.068 + or - .001 eV (1027.4 + or - 0.1 A)
Angular distribution of photoelectrons at 584A using polarized radiation
Photoelectron angular distributions for Ar, Xe, N2, O2, CO, CO2, and NH3 were obtained at 584 A by observing the photoelectrons at a fixed angle and simply rotating the plane of polarization of a highly polarized photon source. The radiation from a helium dc glow discharge source was polarized (84%) using a reflection type polarizer
Analytical photoionization mass spectrometer with an argon gas filter between the light source and monochrometer Patent
Analytical photoionization mass spectrometer with argon gas filter between light source and monochromete
Improved photoionization mass spectrometer
Improved spectrometer for gas analysis lessens the intensity problem that occurs in obtaining dispersed ultraviolet radiation. A filter, consisting of a selectively transmitting gas cell, a thin film or mirror, or a predispersing grating, alleviates problems of interference from higher-order spectral lines and from scattered ultraviolet light
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