نتایج جستجو برای: laser ionization
تعداد نتایج: 207613 فیلتر نتایج به سال:
A reduced graphene oxide (rGO) film was used as the matrix in the matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy (MALDI-TOF-MS) for the detection of octachlorodibenzo-p-dioxin (OCDD) with a detection weight as low as 500 pg.
2014 This paper reports the four-photon ionization of caesium atoms when the laser frequency is tuned through the resonant three-photon transition 6S ~ 6F. This experiment was performed by using a tunable-wavelength bandwidth-limited subnanosecond laser pulse at 1.06 03BCm, in the 108-109 W.cm-2 laser intensity range. Pulse widths of 1.5 ns, 50 ps, and 15 ps were used. The resonant character of...
Reaction and detection click in high-voltage assisted laser desorption ionization mass spectrometry.
A click reaction (copper-catalyzed azide-alkyne cycloaddition) catalyzed by "naked" copper ions (without ligands) generated in situ from a copper substrate by laser ablation in a high-voltage assisted laser desorption/ionization (HALDI) ion source is demonstrated.
Photoionization spectra of Se have been studied by step-wise resonance laser ionization. The Rydberg series 4s24p3(4S)np3P0,1,2 and 4s24p3(4S)np5P1,2,3 were measured via different excitation schemes. Using the 4s24p3(4S)np3P2 with n = 15–49, ionization potential was determined improved precision to 76,658.15(2)stat(4)sys cm?1, which resolved discrepancy in previous literatures. Autoionizing (AI...
any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...
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MALDI ionization mechanisms remain a topic of controversy. Some of the major modern models are compared, with emphasis on those of the author. Primary formation, secondary reaction, and loss mechanisms are considered.
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