Interaction mechanism of some alkyl iodides with femtosecond laser pulses

C. Kosmidis, P. Siozos, S. Kaziannis, L. Robson, K.W.D. Ledingham, P. McKenna, D.A. Jaroszynski

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The interaction of 1-iodopropane, 2-iodopropane, 1-iodobutane, 2-iodobutane, and 1-iodopentane with (5 × 1013-5 × 1015 W/cm2) femtosecond laser fields is studied by means of a time-of-flight mass spectrometer. It is found that multiphoton ionization (MPI) and field ionization (FI) processes are involved in the molecular ionization. The contribution of these processes can be distinguished using the peak profile of the ions in the mass spectra. Thus, from the mass spectra of 2-iodoropane and 2-iodobutane, it is concluded that MPI processes are taking place even for Keldysh parameter values γ 0.3. The field ionization process depends on the characteristics of the molecular binding potential well and leads to an asymmetric charge distribution of the transient multiply charged parent ions. In the case of 1-iodobutane, the MPI processes lead to a stable doubly charged parent ion production with a laser intensity threshold higher than that found for I2+ ions. In addition, the isomers studied exhibit distinct differences in their mass spectra and their origin is discussed in detail.
LanguageEnglish
Pages1279-1285
Number of pages6
JournalJournal of Physical Chemistry A
Volume109
Issue number7
DOIs
Publication statusPublished - 24 Feb 2005

Fingerprint

Iodides
Ultrashort pulses
iodides
Ionization
ionization
pulses
Ions
mass spectra
lasers
interactions
ions
Charge distribution
Mass spectrometers
Isomers
charge distribution
mass spectrometers
isomers
thresholds
Lasers
profiles

Keywords

  • multiply charged ions
  • multiphoton ionization
  • polyatomic molecules
  • coulomb explosion
  • noble gases

Cite this

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title = "Interaction mechanism of some alkyl iodides with femtosecond laser pulses",
abstract = "The interaction of 1-iodopropane, 2-iodopropane, 1-iodobutane, 2-iodobutane, and 1-iodopentane with (5 × 1013-5 × 1015 W/cm2) femtosecond laser fields is studied by means of a time-of-flight mass spectrometer. It is found that multiphoton ionization (MPI) and field ionization (FI) processes are involved in the molecular ionization. The contribution of these processes can be distinguished using the peak profile of the ions in the mass spectra. Thus, from the mass spectra of 2-iodoropane and 2-iodobutane, it is concluded that MPI processes are taking place even for Keldysh parameter values γ 0.3. The field ionization process depends on the characteristics of the molecular binding potential well and leads to an asymmetric charge distribution of the transient multiply charged parent ions. In the case of 1-iodobutane, the MPI processes lead to a stable doubly charged parent ion production with a laser intensity threshold higher than that found for I2+ ions. In addition, the isomers studied exhibit distinct differences in their mass spectra and their origin is discussed in detail.",
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Interaction mechanism of some alkyl iodides with femtosecond laser pulses. / Kosmidis, C.; Siozos, P.; Kaziannis, S.; Robson, L.; Ledingham, K.W.D.; McKenna, P.; Jaroszynski, D.A.

In: Journal of Physical Chemistry A, Vol. 109, No. 7, 24.02.2005, p. 1279-1285.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Interaction mechanism of some alkyl iodides with femtosecond laser pulses

AU - Kosmidis, C.

AU - Siozos, P.

AU - Kaziannis, S.

AU - Robson, L.

AU - Ledingham, K.W.D.

AU - McKenna, P.

AU - Jaroszynski, D.A.

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AB - The interaction of 1-iodopropane, 2-iodopropane, 1-iodobutane, 2-iodobutane, and 1-iodopentane with (5 × 1013-5 × 1015 W/cm2) femtosecond laser fields is studied by means of a time-of-flight mass spectrometer. It is found that multiphoton ionization (MPI) and field ionization (FI) processes are involved in the molecular ionization. The contribution of these processes can be distinguished using the peak profile of the ions in the mass spectra. Thus, from the mass spectra of 2-iodoropane and 2-iodobutane, it is concluded that MPI processes are taking place even for Keldysh parameter values γ 0.3. The field ionization process depends on the characteristics of the molecular binding potential well and leads to an asymmetric charge distribution of the transient multiply charged parent ions. In the case of 1-iodobutane, the MPI processes lead to a stable doubly charged parent ion production with a laser intensity threshold higher than that found for I2+ ions. In addition, the isomers studied exhibit distinct differences in their mass spectra and their origin is discussed in detail.

KW - multiply charged ions

KW - multiphoton ionization

KW - polyatomic molecules

KW - coulomb explosion

KW - noble gases

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