A mass spectrometric investigation of isomers of butane

T. Y. Alic, H. S. Kilic, H. Durmus, M. Dogan, K. W. D. Ledingham

Research output: Contribution to journalArticle

Abstract

Butane is an important industrial chemical in which photo-processes are very important for the initiation of reactions. Recent advances in nanosecond pulsed laser technology have led to high laser intensities being available to researchers to enable these photo-processes to be studied in compounds such as butane. The photo-decomposition, dissociation and combustion mechanisms in the neutral butane molecule have been studied in detail, by investigating the multiphoton (MP) dissociative ionisation of its n- and i-isomers, using a time-of-flight mass spectrometer connected to a high power nanosecond laser system. The laser used was a Nd:Yag with a 5 ns pulse width operated at the fundamental wavelength (1064 nm) and the doubled and tripled wavelengths (532 nm and 355 nm). The fragmentation patterns for the isomers were determined for the three wavelengths as a function of laser intensity. Similar laser intensities of between 1010 and 1013 W/cm2 were used at the three wavelengths: 1064, 532 and 355 nm. The mass spectra of each isomer of the butane molecule display a very weak molecular ion and are dominated by fragment ion peaks. The degree of fragmentation increases as the laser intensity increases. Depending on the wavelength some significant differences in the mass spectra of the two isomers were detected and it has been concluded that the isomerisation of i-butane to n-butane is a process which is faster than the duration of the laser pulse used
LanguageEnglish
Pages893-905
Number of pages13
JournalRapid Communications in Mass Spectrometry
Volume26
Issue number8
Early online date1 Mar 2012
DOIs
Publication statusPublished - 30 Apr 2012

Fingerprint

Isomers
Wavelength
Lasers
Ions
Industrial chemicals
Molecules
High power lasers
Mass spectrometers
Isomerization
Pulsed lasers
Ionization
butane
Laser pulses
Decomposition

Keywords

  • shock waves
  • polyatomic-molecules
  • photodissociation dynamics
  • electron-impact
  • thermal-decomposition
  • n-butane
  • intense laser pulses
  • bond dissociation energies
  • flame
  • multiphoton ionization

Cite this

Alic, T. Y. ; Kilic, H. S. ; Durmus, H. ; Dogan, M. ; Ledingham, K. W. D. / A mass spectrometric investigation of isomers of butane. In: Rapid Communications in Mass Spectrometry . 2012 ; Vol. 26, No. 8. pp. 893-905.
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A mass spectrometric investigation of isomers of butane. / Alic, T. Y.; Kilic, H. S.; Durmus, H.; Dogan, M.; Ledingham, K. W. D.

In: Rapid Communications in Mass Spectrometry , Vol. 26, No. 8, 30.04.2012, p. 893-905.

Research output: Contribution to journalArticle

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