We present mixed gauge R-matrix Floquet calculations of multiphoton ionization of Li within a single active electron local model potential. The laser frequency ranges from 15 000 to 15 800 cm, and at least three photons are needed to ionize the electron in the 2s ground state. We found that the measured ionization rate as a function of photon frequency results from ionization processes in diffe...

Microprobe laser desorption/laser ionization mass spectrometry (microL(2)MS) is a sensitive and selective technique that has proven useful in the qualitative and semiquantitative detection of trace organic compounds, particularly polycyclic aromatic hydrocarbons (PAHs). Recent efforts have focused on developing microL(2)MS as a quantitative method, often by measuring the ratio of signal strengt...

Laser desorption/ionization techniques were firstly developed in the early seventieth years [1] but only in the late eighteenth [2, 3], with the introduction of matrix-assisted laser desorption/ionization, they became an established method for the mass spectrometry of macromolecular compounds. The role of matrix is to absorb UV laser radiation and to give the energy to the analyte, often not ab...

The significant modification of capture and ionization probabilities in ion – atom collisions, assisted by a strong laser field (above 1012 W/cm2), has been demonstrated theoretically [1–3]. So far, however, an experimental test has not been performed, due to the difficult synchronization of a collision with a laser pulse [1, 3]. We present electron capture and ionization probabilities for ion ...

Strong few-cycle lasers enable sequential ionization of more than one electron per optical half-cycle. Understanding these correlated electron ionization events is crucial in developing a model of ionization dynamics in few-cycle laser fields and describing the foundations of laser plasma generation [1]. We have developed an experimental setup capable of characterizing correlated ionization eve...

Electrochemical or photo-electrochemical reactions in both electrospray ionization and laser desorption ionization are discussed stressing the role of the electrode reaction in influencing the ionization process. In particular, upon application of a high voltage during electrospray ionization, the emitter includes a working electrode, where redox reactions are observed, such as electro-generati...

Resonance ionization laser ion sources (RILIS) are applied for the production of exotic ion beams with high isotopic and isobaric purity [1], limited only by surface ionization of unwanted atomic species. A new type of resonance ionization laser ion source is presently being deve-loped and tested at the RISIKO mass separator at Mainz University [2] for future use at on-line radioactive ion beam...

Observations of double ionization by femtosecond-scale near-optical laser pulses with intensities above about 10W/cm revealed a prominent surprising feature. The doubly ionized ion count, as a function of incident laser intensity, was observed to be significantly above the value predicted by the famous ADK ionization formula [1], which is used to describe non-correlated tunneling escape of two ...

Using a semiclassical rescattering model, the momentum distributions of recoil ions from laser induced single and double ionization are obtained. Not only in the case of double ionization but also in the case of single ionization, the distributions of the momentum parallel to the polarization direction of the laser field show a double-hump structure as a consequence of the rescattering. By comp...