Resonance enhanced laser ionisation mass spectrometry of four aromatic molecules

Rettner, Charles; Brophy, John H.

doi:10.1016/0301-0104(81)85099-9

Cited by 38 publications

(17 citation statements)

References 24 publications

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“…If one of the ionization steps is saturated, the quadratic intensity dependence of the ionization rate will change to exhibit a more linear behavior. Besides this intrinsic intensity dependency, geometrical effects of the laser beam may result in a non-integer deviation from the formal intensity law, as was shown by Brophy et al [18,19].…”

Section: Introductionmentioning

confidence: 86%

Determination of Relative Ionization Cross Sections for Resonance Enhanced Multiphoton Ionization of Polycyclic Aromatic Hydrocarbons

et al. 2018

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Resonance enhanced multiphoton ionization (REMPI) is a powerful method for the sensitive determination of polycyclic aromatic hydrocarbons (PAHs) in gaseous mixtures via mass spectrometry (MS). In REMPI, ions are produced by the absorption of at least two photons including defined electronic intermediate states. As a result—unlike other laser-based ionization techniques—spectroscopic selectivity is involved into the ionization process. Nevertheless, these wavelength-dependent ionization rates impede the quantification using REMPI. For this purpose, relative photoionization cross sections (relPICS) give an easy-to-use approach to quantify REMPI-MS measurements. Hereby, the ionization behavior of a single compound was compared to that of a reference substance of a given concentration. In this study, relPICS of selected single-core aromatics and PAHs at wavelengths of 266 nm and 248 nm were determined using two different time-of-flight mass spectrometric systems (TOFMS). For PAHs, relPICS were obtained which showed a strong dependence on the applied laser intensity. In contrast, for single-core aromatics, constant values of relPICS were determined. Deviations of relPICS between both TOFMS systems were found for small aromatics (e.g., benzene), which can be assigned to the differences in UV generation in the particular system. However, the relPICS of this study were found to be in good agreement with previous results and can be used for system-independent quantification.

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Section: Introductionmentioning

confidence: 86%

Determination of Relative Ionization Cross Sections for Resonance Enhanced Multiphoton Ionization of Polycyclic Aromatic Hydrocarbons

et al. 2018

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“…Further qualitative results involving the MPI mass spectrum of aniline and several of its derivatives are reported by Rettner et al, 140 Leutwyler et al, 164 and Boesl et al 165 Leutwyler(1) used aniline as an example of the isotopic selectivity present in the resonantly enhanced two-photon ionization process. Small shifts in the absorption profiles allow one to preferentially ionize one species.…”

Section: Anilinementioning

confidence: 79%

Laser multiphoton ionization-dissociation mass spectrometry

Gobeli¹,

Yang²,

El‐Sayed³

1985

Chem. Rev.

101

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“…We have chosen 320.16 nm because there is an absorption line there. In addition, (b) (d) (1) CiH* (2) C2Hn+, (3) C3H"+, (4) C4 Hn+, (5) C, H"+, (6) CeH" , (8) C8H" , (P) parent peak (C10H"). (b) is the same as (a) except the time base Is 1 Msec/division.…”

Section: Resultsmentioning

confidence: 99%

“…The horizontal scale Is 2 Ms/dlvislon.The input power from the laser is 1.65 mJ. The peaks are labeled as follows: (1) CiH*(2) C2Hn+,(3) C3H"+,(4) C4 Hn+,(5) C, H"+,(6)…”

mentioning

confidence: 99%

Comparison of multiphoton ionization (MPI) fragmentation patterns for the azulene and naphthalene isomers. A test of the maximal-entropy theory

Lubman¹

1981

J. Phys. Chem.

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We present an experimental test of the Silberstein-Levine maximal-entropy theory of multiphoton ionization-fragmentation using the isomeric pair azulene and naphthalene. According to this theory the fragmentation depends upon the mean energy absorbed and the chemical formula of the parent molecule. The MPI fragmentation pattern of a compound is strongly dependent upon laser power density. However, it is shown experimentally that it is possible to obtain similar fragmentation patterns for the two CioHg compounds, azulene and naphthalene, at different wavelengths by adjusting the laser power so that each system is excited to what we suppose to be the same value of (E).

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Resonance enhanced laser ionisation mass spectrometry of four aromatic molecules

Cited by 38 publications

References 24 publications

Determination of Relative Ionization Cross Sections for Resonance Enhanced Multiphoton Ionization of Polycyclic Aromatic Hydrocarbons

Determination of Relative Ionization Cross Sections for Resonance Enhanced Multiphoton Ionization of Polycyclic Aromatic Hydrocarbons

Laser multiphoton ionization-dissociation mass spectrometry

Comparison of multiphoton ionization (MPI) fragmentation patterns for the azulene and naphthalene isomers. A test of the maximal-entropy theory

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