Ionisation and fragmentation dynamics of laser desorbed polycyclic aromatic hydrocarbons using femtosecond and nanosecond post-ionisation

L. Robson, A.D. Tasker, K.W.D. Ledingham, P. McKenna, T. McCanny, C. Kosmidis, P. Tzallas, D.A. Jaroszynski, D.R. Jones

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Nanosecond laser desorption/femtosecond laser mass spectrometry (LD/FLMS) incorporating a reflectron time-of-flight mass spectrometer has been used to study the ionisation/fragmentation of polycyclic aromatic hydrocarbons (PAHs) in intense laser fields (7.0×1014 to 9.3×1015 W cm−2). Pulses of 80 fs, 800 nm have been used to post-ionise the PAHs anthracene, tetracene and pentacene. For each molecule strong singly and doubly charged parent ions are observed accompanied by fragmentation. In addition, strong triply charged parent ions (M3+) are observed for anthracene and weaker M3+ signals for tetracene and pentacene are also observed. Nanosecond post-ionisation (266 nm, 16 ns) spectra of the molecules have been recorded and are included for comparison with the femtosecond data. Similarities in the observed fragmentation pattern of low-mass fragments of the nanosecond and low intensity femtosecond spectra are highlighted. In addition, as the laser intensity increases, it is observed that fragmentation pathways preferentially switch from CmH3+ ion yield to Cm+ production for m=2-5 at a critical intensity which is molecule dependent.
LanguageEnglish
Pages69-85
Number of pages16
JournalInternational Journal of Mass Spectrometry
Volume220
Issue number1
DOIs
Publication statusPublished - 15 Sep 2002

Fingerprint

Polycyclic Aromatic Hydrocarbons
polycyclic aromatic hydrocarbons
Polycyclic aromatic hydrocarbons
Ionization
fragmentation
Anthracene
Ions
ionization
Molecules
Lasers
anthracene
lasers
Mass spectrometers
Ultrashort pulses
molecules
ions
Mass spectrometry
Desorption
Switches
mass spectrometers

Keywords

  • laser desorption
  • femtosecond laser
  • mass spectrometry
  • polycyclic aromatic hydrocarbon
  • PAHs
  • multiply charged ions
  • field ionisation

Cite this

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title = "Ionisation and fragmentation dynamics of laser desorbed polycyclic aromatic hydrocarbons using femtosecond and nanosecond post-ionisation",
abstract = "Nanosecond laser desorption/femtosecond laser mass spectrometry (LD/FLMS) incorporating a reflectron time-of-flight mass spectrometer has been used to study the ionisation/fragmentation of polycyclic aromatic hydrocarbons (PAHs) in intense laser fields (7.0×1014 to 9.3×1015 W cm−2). Pulses of 80 fs, 800 nm have been used to post-ionise the PAHs anthracene, tetracene and pentacene. For each molecule strong singly and doubly charged parent ions are observed accompanied by fragmentation. In addition, strong triply charged parent ions (M3+) are observed for anthracene and weaker M3+ signals for tetracene and pentacene are also observed. Nanosecond post-ionisation (266 nm, 16 ns) spectra of the molecules have been recorded and are included for comparison with the femtosecond data. Similarities in the observed fragmentation pattern of low-mass fragments of the nanosecond and low intensity femtosecond spectra are highlighted. In addition, as the laser intensity increases, it is observed that fragmentation pathways preferentially switch from CmH3+ ion yield to Cm+ production for m=2-5 at a critical intensity which is molecule dependent.",
keywords = "laser desorption, femtosecond laser, mass spectrometry, polycyclic aromatic hydrocarbon, PAHs, multiply charged ions, field ionisation",
author = "L. Robson and A.D. Tasker and K.W.D. Ledingham and P. McKenna and T. McCanny and C. Kosmidis and P. Tzallas and D.A. Jaroszynski and D.R. Jones",
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Ionisation and fragmentation dynamics of laser desorbed polycyclic aromatic hydrocarbons using femtosecond and nanosecond post-ionisation. / Robson, L.; Tasker, A.D.; Ledingham, K.W.D.; McKenna, P.; McCanny, T.; Kosmidis, C.; Tzallas, P.; Jaroszynski, D.A.; Jones, D.R.

In: International Journal of Mass Spectrometry , Vol. 220, No. 1, 15.09.2002, p. 69-85.

Research output: Contribution to journalArticle

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T1 - Ionisation and fragmentation dynamics of laser desorbed polycyclic aromatic hydrocarbons using femtosecond and nanosecond post-ionisation

AU - Robson, L.

AU - Tasker, A.D.

AU - Ledingham, K.W.D.

AU - McKenna, P.

AU - McCanny, T.

AU - Kosmidis, C.

AU - Tzallas, P.

AU - Jaroszynski, D.A.

AU - Jones, D.R.

N1 - Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.

PY - 2002/9/15

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N2 - Nanosecond laser desorption/femtosecond laser mass spectrometry (LD/FLMS) incorporating a reflectron time-of-flight mass spectrometer has been used to study the ionisation/fragmentation of polycyclic aromatic hydrocarbons (PAHs) in intense laser fields (7.0×1014 to 9.3×1015 W cm−2). Pulses of 80 fs, 800 nm have been used to post-ionise the PAHs anthracene, tetracene and pentacene. For each molecule strong singly and doubly charged parent ions are observed accompanied by fragmentation. In addition, strong triply charged parent ions (M3+) are observed for anthracene and weaker M3+ signals for tetracene and pentacene are also observed. Nanosecond post-ionisation (266 nm, 16 ns) spectra of the molecules have been recorded and are included for comparison with the femtosecond data. Similarities in the observed fragmentation pattern of low-mass fragments of the nanosecond and low intensity femtosecond spectra are highlighted. In addition, as the laser intensity increases, it is observed that fragmentation pathways preferentially switch from CmH3+ ion yield to Cm+ production for m=2-5 at a critical intensity which is molecule dependent.

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KW - laser desorption

KW - femtosecond laser

KW - mass spectrometry

KW - polycyclic aromatic hydrocarbon

KW - PAHs

KW - multiply charged ions

KW - field ionisation

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T2 - International Journal of Mass Spectrometry

JF - International Journal of Mass Spectrometry

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