Mass spectrometry of aromatic molecules with resonance-enhanced multiphoton ionization

Study on the interaction between different solute molecules in a molecular beam produced by the spray-jet technique: an application to dendrimer/dye system

“…The supersonic jet technique combined with a pulsed nozzle is one of the most powerful methods for the characterization of neutral volatile molecules [1], using spectroscopic methods such as resonantly enhanced multiphoton ionization (REMPI) spectroscopy and laser-induced fluorescence (LIF) spectroscopy [2][3][4]. However, it is difficult to access neutral non-volatile molecules with this technique.…”

Ionisation von Makromolekülen durch Bestrahlung mit Laserlicht (Nobel‐Vortrag)

“…[4] In den meisten Fällen beruhte diese Art von Ionisation auf der Ablösung von Elektronen von gasförmigen Verbindungen. [5] …”

Continued Investigations of New Concepts for Improved Spectrochemical Analysis

“…The ability of resonance-enhanced multiphoton ionization to discriminate chemically similar molecules in a simple mixture has been demonstrated [79]. A second approach is to use nonresonant photoionization to ionize all compounds whose ionization potentials lie below a threshold value determined by the photon energy.…”

“…It is possible to obtain parents-only ionization by this approach, by using a low energy density (i.e., low laser power). In general, the power necessary to accomplish this appears to vary with the molecule (79], and so it will likely be necessary to adjust not only the wavelength, but also the laser power for each compound analyzed, in order to obtain soft ionization. The H 2 laser itself is a "superradiant" device which has no mirrors to align.…”