Photoionization of atomic fluorine
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We use R-matrix method to study the near threshold (17.5eV-20eV) photoionization of neutral fluorine atom and obtain total photoionization cross sections in 3P to 1D range. The theoretical calculation results fit the experimental results better after we consider core-valence electron correlation.Keywords:
Fluorine
Valence electron
Photoionization mode
Photoionization mode
Quantum defect
Rydberg state
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基本胆固醇与红外激光 desorption/tunable 同步加速器真空被分析紫外光电游离团 spectrometry。胆固醇的一个独占的分子的离子被近的阀值观察有高效率的单个光子的电离。碎片随光子精力的增加被产出。各种各样的碎片的结构与商业电子电离 time-of-flight 团 spectrometry 被决定。主导的破碎小径在 ab initiocalculations 的帮助下详细被讨论。
Photoionization mode
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Chemists typically use photoionization and photoionization mass spectroscopy for two types of experiments. In one case, the goal is measurement of thermodynamic and spectroscopic properties. In the other case, reaction mechanisms and kinetics are probed; photoionization is used for selective identification of key species in a complex reacting mixture. The utility of photoionization stems from the ability to tie thermodynamic values to accurately measured wavelengths and the sensitivity of ion (or electron) detection.
Photoionization mode
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A vacuum ultraviolet monochromator and a quadrupole mass spectrometer have been combined with the differential pumping systems, since hydrogen, helium and argon gases were used as the carrier gas for the photon source. The photoionization efficiency curves were observed by the hydrogen many-line spectrum. The photoionization efficiency curves for the parent and the fragment ions of (CH3)2 CO have been measured with the photon band width of 0.9Å. For the parent ion, autoionization for super-excited states was first observed in the threshold region of the photoionization.
Photoionization mode
Monochromator
Autoionization
Quadrupole mass analyzer
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Photoionization mode
Double ionization
Autoionization
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The probabilities of photoionization of hydrogen molecular ion by ultrashort laser field were evaluated on base of earlier developed trajectory method. The results are obtained in a wide range of field magnitudes up to superatomic fields approaching relativistic intensities. In a weak field gained results are in good agreement with the data obtained by other methods. In a strong field the photoionization probability behaviour resembles some features of the so called stabilization effect in atoms.
Photoionization mode
Hydrogen molecule
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Photoionization mode
Atmospheric-pressure laser ionization
Thermal ionization
Resonance-enhanced multiphoton ionization
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Photoionization mass spectrometry experiments, performed on an extensive size range of aluminum clusters produced by laser vaporization technique, are reported. Ionization potential values are deduced from individual photoionization efficiency curves for the smaller AlN clusters (N=36–112). Our results confirm and complete those previously published. The mass spectra of larger clusters (N≊250–1400) reveal a regular signal oscillation. Several additional experiments give proof that this striking pattern originates from size-dependent ionization threshold effects. This structure exhibits exact periodicity as a function of N1/3 or Ne1/3 (Ne the number of valence electrons).
Valence electron
Photoionization mode
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Autoionization
Photoionization mode
Rydberg state
R-matrix
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