رسالة جامعية
Mass Spectrometry Performed Under Ultrafast Stress-Confinement Conditions ; Massenspektrometrie-Messungen Durchgeführt Unter Bedingungen der Ultraschnellen Stress-Confinement
| العنوان: | Mass Spectrometry Performed Under Ultrafast Stress-Confinement Conditions ; Massenspektrometrie-Messungen Durchgeführt Unter Bedingungen der Ultraschnellen Stress-Confinement |
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| المؤلفون: | Pieterse, Cornelius Louwrens |
| المساهمون: | Miller, R.J. Dwayne (Prof. Dr.) |
| بيانات النشر: | Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky |
| سنة النشر: | 2018 |
| المجموعة: | E-Dissertationen der Universität Hamburg |
| مصطلحات موضوعية: | Time-of-flight mass spectrometry, Laser ablation, Laser desorption, Femtosecond techniques, Photon-stimulated desorption, 530 Physik, 33.05 Experimentalphysik, 35.10 Physikalische Chemie: Allgemeines, ddc:530 |
| الوصف: | The subject of this dissertation was to demonstrate the advantages of performing mass spectrometry measurements under the conditions of stress-confinement. To be in a position to discuss such measurements, there was the need to develop a high-performance time-of-flight mass spectrometer in-house, since commercially available instruments do not allow the scientist the freedom to adequately study the underlying physical mechanisms. Furthermore, due to the high complexity of the datasets generated by these studies, there was a definite need for novel data analysis routines to improve the quality of the available information. Laser desorption mass spectrometry is an established, but not yet adequately quantitative analytical technique. One of the primary reasons for this unfortunate limitation is because the desorption and ionisation processes are highly coupled. Consequently, this does not allow the ionisation efficiency to be varied without varying the amount of material desorbed and vice versa. The only way to get past this inherent deadlock is to separate these two processes. Interestingly, molecular dynamics simulations have suggested that when performing mass spectrometry measurements under stress-confinement conditions the desorption and ionisation processes would become separable. It is for this reason why there was a basic need to understand the desorption and ionisation mechanisms under these conditions since an appropriate understanding could potentially facilitate laser desorption mass spectrometry to become more quantitative. Within this thesis, it has been established that there are numerous advantages to performing mass spectrometry studies under conditions of stress-confinement. The practicality of this concept was demonstrated both at atmospheric conditions by using a picosecond infrared laser for studying bulk water samples and under high-vacuum by utilising a femtosecond ultraviolet laser with standard matrices. The atmospheric studies indicated that the infrared laser produces mass spectra which ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| العلاقة: | http://nbn-resolving.de/urn:nbn:de:gbv:18-92874Test; https://ediss.sub.uni-hamburg.de/handle/ediss/7819Test |
| الإتاحة: | http://nbn-resolving.de/urn:nbn:de:gbv:18-92874Test https://ediss.sub.uni-hamburg.de/handle/ediss/7819Test |
| حقوق: | http://purl.org/coar/access_right/c_abf2Test ; info:eu-repo/semantics/openAccess ; No license |
| رقم الانضمام: | edsbas.9B36CFB7 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |