Three-dimensional tomographic reconstruction of ultrashort free electron wave packets

Wollenhaupt, M.; Krug, M.; Köhler, Jens; Bayer, Tim; Sarpe-Tudoran, C.; Baumert, Thomas

doi:10.1007/s00340-009-3513-0

Cited by 105 publications

(111 citation statements)

References 26 publications

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“…Such findings support the appropriateness of TAM across-cultural differences. In accordance with other research, PU had the most direct and strongest effect on ITU in comparison to other factors (Davis et al, 1989;Park, 2009;Tarhini et al, 2015;Teo, 2008;Teo, 2009). This research is in agreement with such studies.…”

Section: Discussionsupporting

confidence: 91%

“…Convergent and discriminant validity were also examined. Convergent validity means "the extent to which indicators of a factor that are theoretically related should correlate highly" (Park, 2009;p. 155).…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, understanding factors that may affect learner satisfaction and technology acceptance can help LMS providers in applying special strategies to attract students in adopting this learning form (Park, 2009). It is a contention of this paper that there is a gap in the research for the Middle East that empirically identifies the synergy among psychological and cognitive factors that may influence learner satisfaction and/or behavioural intention in a blended learning mode.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigating the effect of learning styles in a blended e-learning system: An extension of the technology acceptance model (TAM)

Al-Azawei

Parslow

Lundqvist

2016

AJET

174

157

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This study assesses learner perceptions of a blended e-learning system (BELS) and the feasibility of accommodating educational hypermedia systems (EHSs) according to learning styles using a modified version of the technology acceptance model (TAM). Recently, Moodle has been adopted by an Iraqi university alongside face-to-face (F2F) classrooms to provide flexible learning and improve understanding. Based on TAM, individual differences and perceptions were explored in relationships between learner satisfaction and technology adoption. The model was extended to include e-learning self-efficacy, perceived satisfaction, and learning styles. Although other variables can be integrated, the proposed framework is to investigate the effect of learning styles in predicting satisfaction and BELS acceptance. A total of 210 undergraduate students voluntarily took part in the research. Data was gathered using a survey instrument and the Index of Learning Styles (ILS) Questionnaire. Partial least squares structural equation modelling (PLS-SEM) technique was used to examine the path associated between dependent and independent constructs. Unlike prior TAM literature, this research highlights the integration of perceived satisfaction and technology acceptance in accordance with psychological traits and learner beliefs. Overall, the model achieved an acceptable fit and successfully integrated intention to use (ITU) and perceived satisfaction (PS). However, psychological differences did not indicate positive impacts on learner satisfaction and e-learning adoption.

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Section: Discussionsupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigating the effect of learning styles in a blended e-learning system: An extension of the technology acceptance model (TAM)

Al-Azawei

Parslow

Lundqvist

2016

AJET

174

157

View full text Add to dashboard Cite

show abstract

“…8 However, despite the high cost of these cameras, the time resolution is still not sufficient to slice electrons. Baumert and co-workers 12 and Corkum and co-workers 13 developed tomographic reconstruction methods of 3D electron distributions by taking 2D images at many different polarization angles with respect to the detector. The procedure for such reconstruction methods is lengthy and the demonstrated energy resolution was limited.…”

Section: Introductionmentioning

confidence: 99%

Communication: Time- and space-sliced velocity map electron imaging

Lee

Lin

Lingenfelter

et al. 2014

The Journal of Chemical Physics

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We develop a new method to achieve slice electron imaging using a conventional velocity map imaging apparatus with two additional components: a fast frame complementary metal-oxide semiconductor camera and a high-speed digitizer. The setup was previously shown to be capable of 3D detection and coincidence measurements of ions. Here, we show that when this method is applied to electron imaging, a time slice of 32 ps and a spatial slice of less than 1 mm thick can be achieved. Each slice directly extracts 3D velocity distributions of electrons and provides electron velocity distributions that are impossible or difficult to obtain with a standard 2D imaging electron detector. © 2014 AIP Publishing LLC. [http://dx

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“…A careful comparison of this type of conventional ion imaging with PImMS has previously been made [11]. For full 3D imaging without the requirement of cylindrical symmetry, one can also employ tomographic techniques [48][49][50]. This works well, but requires yet more sequential data acquisition -specifically the recording of multiple 2D images as a function of pump-probe laser polarization with respect to the detector (projection) plane.…”

Section: Discussionmentioning

confidence: 99%

Time-resolved multi-mass ion imaging: femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera

Hockett¹,

Forbes²,

Makhija³

et al.

Authorea

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The Pixel-Imaging Mass Spectrometry (PImMS) camera allows for 3D charged particle imaging measurements, in which the particle time-of-flight is recorded along with (x, y) position. Coupling the PImMS camera to an ultrafast pump-probe velocity-map imaging spectroscopy apparatus therefore provides a route to time-resolved multi-mass ion imaging, with both high count rates and large dynamic range, thus allowing for rapid measurements of complex photofragmentation dynamics. Furthermore, the use of vacuum ultraviolet wavelengths for the probe pulse allows for an enhanced observation window for the study of excited state molecular dynamics in small polyatomic molecules having relatively high ionization potentials. Herein, preliminary time-resolved multi-mass imaging results from C2F3I photolysis are presented. The experiments utilized femtosecond UV and VUV (160.8 nm and 267 nm) pump and probe laser pulses in order to demonstrate and explore this new time-resolved experimental ion imaging configuration. The data indicates the depth and power of this measurement modality, with a range of photofragments readily observed, and many indications of complex underlying wavepacket dynamics on the excited state(s) prepared.

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Three-dimensional tomographic reconstruction of ultrashort free electron wave packets

Cited by 105 publications

References 26 publications

Investigating the effect of learning styles in a blended e-learning system: An extension of the technology acceptance model (TAM)

Investigating the effect of learning styles in a blended e-learning system: An extension of the technology acceptance model (TAM)

Communication: Time- and space-sliced velocity map electron imaging

Time-resolved multi-mass ion imaging: femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera

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