نتایج جستجو برای: ion trap
تعداد نتایج: 229696 فیلتر نتایج به سال:
We present experimental results, as well as numerical simulations, for the transverse velocity distribution of ions stored in an electrostatic ion beam trap. The measurements indicate that the transverse velocity spread is about 1% of the longitudinal velocity, and that the ions fill the whole transverse stable phase space. We also demonstrate that ion losses from the trap due to multiple scatt...
Akronnal (M + 1)/M retloe In the lon trap mas8 spectrometer were examlned to resolve questions about their source. Comporwkshowlng “rrl f r a g ” plovlde normal (M + 1)/M ratios except undar condnkns of space charglng (high ion com8nbaUan). SWtamas provldhg akmlant alkyl Ions form (M + H)’ Ions through proton transfer to neutrals. Concentrations causing thls effect In the Ion trap mass spectrom...
We demonstrate that the synchronization effect observed [Pedersen et al., Phys. Rev. Lett. 87, 055001 (2001)]], when a bunch of ions oscillates between two mirrors in an electrostatic ion beam trap, can be explained as a negative mass instability. We derive simple necessary conditions for the existence of a regime in which this dispersionless behavior occurs and demonstrate that in this regime,...
A new type of ion trap is used to measure the radiative lifetime of the NO(a S) metastable state. The ion trap is designed to store ion beams with an energy of a few keV and is well suited for the study of metastable states. The measured value for the radiative lifetime is tr5760630 ms, in good agreement with the last experimental values of Calamai and Yoshino @J. Chem. Phys. 101, 9480 ~1994!#,...
With the increasing popularity of atmospheric pressure ionization (API) mass spectrometric techniques, electrospray ionization has become a widespread tool for quantitative determinations. When the sample matrix is complex, electrospray ionization can result in the formation of nondesolvated, charged residues as well as analyte ions (see Figure 1). These nondesolvated residues contaminate the i...
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