Dynamics of D3+slow dissociation induced by intense ultrashort laser pulses

Abstract

The dissociation of D 3 + in intense ultrashort laser pulses is investigated using an improved coincidence three-dimensional momentum imaging method that allows clear separation of all fragmentation channels and the determination of the kinetic energy release down to zero. Our results, using 10-fs, 790-nm pulses, suggest that a large peak at low kinetic energy release is associated with the D + + D 2 dissociation channel of D 3 + . The most likely dissociation pathways leading to two-body breakup of D 3 + are identified with additional measurements using 25-fs, 790-nm and 40-fs, 395-nm pulses. We also show that the slow D + + D 2 dissociation dynamics can be manipulated by the pulse duration.

Fragmentation ofCD+induced by intense ultrashort laser pulses

“…1(a), can be set to direct the low-KER fragments off the Faraday cup, thus enabling their detection. This technique was employed by Gaire et al [20] to study the dissociation of D 3 + down to near zero KER (limited to about ∼ 0.8 meV only by the detector resolution).…”

“…The ability to perform kinematically complete measurements and identify fragmentation channels unambiguously has deepened our understanding of laser-ion interactions [15,16,[19][20][21][22][23][24][25][26][27][28]. Heteronuclear molecules are an interesting subject for laser fragmentation studies due to their identifiable breakup channels, but they can present additional experimental challenges, especially as the mass ratio between the fragments increases.…”

Elucidating isotopic effects in intense ultrafast laser-driven D2H+fragmentation

“…+ fragmentation 2 out, by ourselves [20,21,22,23,24] and Alexander et al [25]. Due to its basic structure, measurements of H + 3 can provide a benchmark for theory -and ultimately help develop the theoretical tools needed to explore larger systems, as exemplified by Lötstedt et al [26,27].…”

“…While raw data is presented in figure 1, after applying momentum conservation, the false correlations distributed throughout the plot are discriminated against as shown, for example, in figure 2 of Ref. [23].…”

“…Specifically, the pathways involved at 7 fs are expected to result in final excitation to the 2 1 A state at R∼4.8, 3.8 and 3.3 a.u. with KER values of about 0.6, 1.0 and 2.1 eV, respectivelysee [23,24] These experimental results should serve as a benchmark for any such theory and help pave the way for exploring ever more complicated systems.…”