An innovative approach to multiparticle three-dimensional imaging

Strasser, Daniel; Urbain, Xavier; Pedersen, H. B.; Altstein, N.; Heber, O.; Wester, Roland; Bhushan, K. G.; Zajfman, D.

doi:10.1063/1.1305514

Cited by 46 publications

(33 citation statements)

References 12 publications

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“…The camera retrieves the (x,y) coordinates of the spots with 80 m resolution and the arrival time of the particles with 1 ns resolution. 26,27 The camera is the master clock of the experiment and it runs at 25 Hz.…”

Section: ͑2͒mentioning

confidence: 99%

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Dinu

Picard

Zande

2004

The Journal of Chemical Physics

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We present single-photon spectroscopy in molecular hydrogen starting from the metastable c 3 ⌸ u Ϫ state to a number of triplet nd-Rydberg states (vϭ0 -4, nϭ12-20). Using fast beam spectroscopy both the autoionization channel and the predissociation channel are quantified, field free, as well as with small electric fields. Coupling with the i 3 ⌸ g state is assumed to be responsible for field-free predissociation of the vϭ0 Rydberg levels. The stronger observed predissociation channel of the vϭ1 Rydberg levels is due to the nonadiabatic interaction with the h 3 ⌺ g ϩ state in combination with l mixing due to an external electric field. No direct evidence is found for possible electric field induced predissociation of the gerade Rydberg states by low lying ungerade states. The competition between autoionization and predissociation is discussed in terms of possible consequences for dissociative recombination involving low energy electron collisions with the H 2 ϩ molecular ion.

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Section: ͑2͒mentioning

confidence: 99%

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Dinu

Picard

Zande

2004

The Journal of Chemical Physics

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“…In other fields of science and technology, the development of wide-field TCSPC will also benefit methods where single photon time-of-flight measurements are required, for example Geiger mode LIDAR [191,192], ion velocity mapping [78,85,86] or photon correlation techniques [196]. Many wide-field TCSPC methods are currently based on MCPs, a mature technology used especially in astronomy and medical imaging, but there is a trade-off between count rate and time resolution.…”

Section: Resultsmentioning

confidence: 99%

“…A similar ∆ of a few 10s of ps, so photon arrival time information is preserved. double exposure approach has been used previously for ion velocity mapping, where one [85] or two [86] CCD cameras were used at 25 Hz frame rate.…”

Section: 11b Photon Arrival Timing From the Phosphor Decaymentioning

confidence: 99%

Wide-field TCSPC: methods and applications

Hirvonen

Suhling

2016

Meas. Sci. Technol.

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“…The second possibility is to add time resolution to an imaging MCP detector, which requires a time-sensitive read-out system of the phosphor screen. This has been achieved by imaging the phosphor screen with two independent and differently timed CCD cameras [183] or by using a single fast, double exposure CCD camera [184]. Even though more sensitive to multi-hit limitations, the first strategy has become the more popular choice due to much higher timing resolution.…”

Section: D Particle Imagingmentioning

confidence: 99%

Resolving Strong Field Dynamics in Cation States of CO_2 via Optimised Molecular Alignment

Oppermann

2014

Springer Theses

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In this thesis, the role of the molecular structure in strong field induced processes in CO 2 is resolved by the use of optimised impulsive molecular alignment. Two processes were investigated: recollision induced ionisation and the dissociation of the molecular ion CO + 2 . Both processes are driven by the initial tunneling ionisation of CO 2 . Through the use of molecular alignment, the orbital symmetries of the involved molecular ionic states were resolved, revealing the internal molecular dynamics in the form of ionisation and excitation pathways.A novel data analysis procedure was developed to extract the alignment distribution and rotational temperature of the impulsively aligned molecular ensemble. This facilitated the optimisation of molecular alignment in mixed gas samples and was demonstrated for N 2 , O 2 and CO 2 seeded in Ar.The recollision induced or nonsequential double ionisation (NSDI) of CO 2 was then studied in the molecular frame. The process was fully characterised by measuring the shape of the recolliding electron wavepacket and the angularly resolved inelastic electronion recollision cross section. The results reveal the contribution from both the ionic ground and first excited state of CO + 2 to the NSDI mechanism. This study was extended to the strong field induced dissociation of impulsively aligned CO + 2 . It was found that dissociation is driven by a parallel dipole transition from the second excited ionic state B to the predissociating state C, whilst recollision excitation was shown to not play a role. The strong field induced coupling of the ionic states B and C could thus be controlled by the laser polarisation.The results obtained in this thesis further the understanding of population dynamics of cation states in strong field processes. This is of special interest for extending molecular strong field physics to the study of electronic degrees of freedom and their coupling to the nuclear motion. had hoped for in a research degree and I cannot thank Jon enough for making it such an enriching experience, both professionally and personally.

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An innovative approach to multiparticle three-dimensional imaging

Cited by 46 publications

References 12 publications

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Predissociation and autoionization of triplet Rydberg states in molecular hydrogen

Wide-field TCSPC: methods and applications

Resolving Strong Field Dynamics in Cation States of CO_2 via Optimised Molecular Alignment

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