Systematic discrimination of heptane isomers with femtosecond laser linear time of flight mass spectrometry
Year 2021,
, 170 - 176, 29.03.2021
Yasemin Gündoğdu
Mehmet Taşer
Hamdi Şükür Kılıç
Abstract
The dissociative ionization processes of heptane molecule with nine isomers have been investigated and presented experimentally in detail by courtesy of femtosecond laser mass spectrometry technique with a fundamental wavelength of 800 nm and 90 fs pulse duration in this study. It has been aimed to show that the classification of heptane isomers using factor analysis as statistical method reducing the dimension of obtained data. The main mass ratio of heptane isomers is known as m/z 100 which is obtained. The dissociation process on the parent molecule was dominant at the laser intensity about 1.42 x 1014 W/cm2 used for all isomers. The ions obtained by the breakdown of the main ion peak were primarily determined as factors which were clearly distinguished from each other according to factor 1 and factor 2 axes by applying factor analysis.
Supporting Institution
Selçuk Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü
Thanks
Authors kindly would like to thank,
- Scientific Research Projects Coordination Unit of Selçuk University for financial support via Projects No 17401152.
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Year 2021,
, 170 - 176, 29.03.2021
Yasemin Gündoğdu
Mehmet Taşer
Hamdi Şükür Kılıç
References
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- [4] Edgar G., Calingaert G., Marker R., The preparation and properties of the isomeric heptanes. part i. preparation1, J. Am. Chem. Soc, 51 (1929) 1483-1491.
- [5] Lavanchy A., Houriet R., Gäumann T., The mass spectrometric fragmentation of n‐heptane, Org. Mass. Spectrom., 13 (1978) 410-416.
- [6] Chen J.-H., Dunbar R.C., Fragmentation of n-heptane ions by photodissociation, Int. J. Mass Spectrom. Ion Processes, 72 (1986) 115-123.
- [7] Maiman T.H., Stimulated optical radiation in ruby, Nature, 187 (1960) 493-494.
- [8] Kilic H.S., Ledingham K., Kosmidis C., McCanny T., Singhal R., Wang S., Smith D., Langley A., Shaikh W., Multiphoton ionization and dissociation of nitromethane using femtosecond laser pulses at 375 and 750 nm, The J. of Phys Chem. A, 101 (1997) 817-823.
- [9] Kilic H.S., Comparison of Nanosecond and Femtosecond Laser Mass Spectrometry (FLMS), University of Glasgow, (1997).
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- [21] Kepceoğlu A., Gündoğdu Y., Ledingham K.W.D., Kilic H.S., Real-Time Distinguishing of the Xylene Isomers Using Photoionization and Dissociation Mass Spectra Obtained by Femtosecond Laser Mass Spectrometry (FLMS), Anal. Lett., 53(2) (2020) 290-307.
- [22] Gündoğdu Y., Alptekin H., Karabağlı P., Şahin M., Kilic H.Ş., Discrimination of cancerous and healthy colon tissues: A new laser‐based method, Laser Surg Med., 51 (2019) 363-369.
- [23] Gündoğdu Y., Karabağlı P., Alptekin H., Şahin M., Kılıç H.Ş., Comparison of performances of Principal Component Analysis (PCA) and Factor Analysis (FA) methods on the identification of cancerous and healthy colon tissues, Int. J. Mass Spectrom., 445 (2019) 116204.
- [24] Wiley W., McLaren I.H., Time‐of‐flight mass spectrometer with improved resolution, Rev. Sci. Instrum., 26 (1955) 1150-1157.
- [25] Gündoğdu Y., Kepceoğlu A., Kılıç H.Ş., Akbaş M., Doğan M., Ledingham K.W., Femtosaniye Laser Pulsları Yardımıyla Cn+ (n= 1… 60) Topak İyonlarının Hem C60 Hemde Grafit Hedefler Kullanılarak Ayrı Ayrı Üretimi ve Ölçümü (021101)(1-9), Afyon Kocatepe University J. Sci. and Engin., 14 (2014) 1-9.
- [26] Ritter G.L., Lowry S.R., Isenhour T.L., Wilkins C.L., Factor analysis of the mass spectra of mixtures, Anal. Chem., 48 (1976) 591-595.
- [27] Rozett R.W., Petersen E.M., Methods of factor analysis of mass spectra, Anal. Chem., 47 (1975) 1301-1308.
- [28] National Instute of Standards and Technology-NIST Chemistry WebBook, Available at : https://webbook.nist.gov/cgi/cbook.cgi?ID=C142825&Mask=200#Mass-Spec, NIST, (2020).
- [29] Ledingham K.W., Deas R.M., Marshall A., McCanny T., Singhal R.P., Kilic H.S., Kosmidis C., Langley A.J., Shaikh W., A comparison of femtosecond and nanosecond multiphoton ionization and dissociation for some nitro‐molecules, Rapid Commun. Mass Spectrom., 9 (1995) 1522-1527.