Gas Chromatography/Multiphoton Ionization/Mass Spectrometry of Polychlorinated Dibenzofurans Using Nanosecond and Femtosecond Lasers

Trace Analysis of Polycyclic Aromatic Hydrocarbons Using Gas Chromatography-Mass Spectrometry Based on Nanosecond Multiphoton Ionization

“…7,12,18 One microliter of the sample solution was injected into a GC system (Agilent Technologies, 6890N) using an auto-sampler (Agilent Technologies, 7683B), followed by separation using an HP-5 capillary column (length, 30 m; i.d., 0.32 mm). Helium was used as a carrier gas at a constant flow rate of 1 mL/min.…”

“…A laser with a short pulse duration has been utilized for the ionization of aromatic compounds. 10,11 For example, a femtosecond laser was successfully used for the efficient ionization of chlorinated and brominated PAHs 12,13 before relaxation by internal conversion and intersystem crossing to triplet levels. Unfortunately, the size, monetary cost, and difficulties associated with the maintenance and operation of such lasers prevent the practical use of this method in environmental analysis.…”

Selective Ionization of 2,4-Xylenol in Mass Spectrometry Using a Tunable Laser and Supersonic Jet Technique

“…Thus, the wavelength of the 0-0 transition was increased in the order of o-, m-and p-ethylphenol, which is identical to the order of o-, m-and p-chlorophenols. 15 This result could be explained by the fact that both compounds have an electron-donating substituent in a molecule.…”

Application of Hadamard transform to gas chromatography/nonresonant multiphoton ionization/time‐of‐flight mass spectrometry

“…It is sensitive and useful when combined with TOFMS, the so‐called MPI/TOFMS. This is particularly useful, when a femtosecond laser is used in conjunction with the MPI/TOFMS technique, the ionization efficiency can be improved significantly 1–4. With such a superior characteristic, the measurements of dioxin precursors and non‐chlorinated aromatic compounds have been reported 5–7.…”