Ionization and fragmentation of OCS and CS2 after photoexcitation around the sulfur 2p edge

Ankerhold, U.; Esser, B.; Busch, F.

doi:10.1016/s0301-0104(97)00111-0

Cited by 26 publications

(23 citation statements)

References 34 publications

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“…Here the TOF distribution for each fragment is within about 90 ns and, according to SIMION R simulations performed on the spectrometer geometry, corresponds to a maximum kinetic energy of 3-4 eV. Thus a total kinetic energy release of the OC + + S + channel of about 7 eV is found, consistent with references 32,33 . With the FEL pulses arriving 39 ps after the NIR pulses the appearance of the two side peaks at the extremal times for each ionic fragment is a clear indication of the action of the alignment laser (red curve in Fig.…”

Section: Resultssupporting

confidence: 87%

“…The action of the NIR alignment laser on OCS was monitored by detecting different ionic fragment channels after ionization above the Sulfur 2p edge with an FEL energy of 194 eV and subsequent Coulomb explosion. The Coulomb explosion occurs because the 2p hole undergoes rapid Auger decay to a doubly ionized state, with a significant branching ratio into two charged fragments 32 . By varying the time delay of the pump and probe pulses, the rotational dynamics of OCS was observed in the temporal structure of the time-of-flight mass spectrum.…”

Section: Methodsmentioning

confidence: 99%

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Impulsive laser-induced alignment of OCS molecules at FERMI

Fraia

Finetti

Richter

et al. 2017

Phys. Chem. Chem. Phys.

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We demonstrate the experimental realization of impulsive alignment of carbonyl sulfide (OCS) molecules at the Low Density Matter Beamline (LDM) at the free-electron laser FERMI. OCS molecules in a molecular beam were impulsively aligned using 200 fs pulses from a near-infrared laser. The alignment was probed through time-delayed ionization above the sulphur 2p edge, resulting in multiple ionization via Auger decay and subsequent Coulomb explosion of the molecules. The ionic fragments were collected using a time-of-flight mass spectrometer and the analysis of ion-ion covariance maps confirmed the correlation between fragments after Coulomb explosion. The analysis of the CO and S channels allowed us to extract the rotational dynamics, which is in agreement with our theoretical description as well as with previous experiments. This result opens the way for a new class of experiments at LDM within the field of coherent control of molecules with the possibilities that a precisely synchronized optical-pump XUV-probe laser setup like FERMI can offer.

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Section: Resultssupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Impulsive laser-induced alignment of OCS molecules at FERMI

Fraia

Finetti

Richter

et al. 2017

Phys. Chem. Chem. Phys.

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“…A comparison with the resonance absorption spectrum reported in Ref. [22] suggests that the Rydberg transition is S2p 3/2 ? 4sr g .…”

Section: Resultsmentioning

confidence: 61%

“…around the S2p ionisation threshold, and detecting (essentially) the total number of electrons liberated [21]. Absolute photon energy values were established using several of the S2p main pre-edge resonance features for calibration [22]. The calibration of the binding energy scale was made using the two narrow lines in the CS þ 2 spectrum with accurately determined energies of 14.4737 and 16.1883 eV, respectively [8].…”

Section: Methodsmentioning

confidence: 99%

Cationic Rydberg states observed in resonantly enhanced electron spectra of CS2

et al. 2009

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“…It is worth mentioning here that though Auger decay primarily leads to double ionization, triple ionization of CS 2 is also possible at this photon energy via double Auger decay as discussed by Eland et al 26 Ankerhold et al 27 report a branching ratio for CS 3+ 2 to be about 10% of the total ion yield for ionization by 174 eV photons. Lavollée 20 also observed triple ionization of CS 2 for ionization around S(2p) threshold.…”

Section: B Fragmentation Channelsmentioning

confidence: 77%

Three body dissociation of ${\rm CS}_2^{2+}$CS22+ subsequent to various S(2p) Auger transitions

Saha

Banerjee

Bapat

2013

The Journal of Chemical Physics

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Fragmentation kinematics of CS2 following various S(2p) Auger transitions is studied. Employing a combination of electron energy analysis and recoil ion momentum spectroscopy, changes in the dissociation channel yields, as well as the differences in the kinematical parameters for various bands of Auger hole states are presented. The fragmentation mechanism for dissociative channels leading to complete atomization of CS2(2+) molecular ion is studied in detail. We find that CS2(2+) does not retain linear geometry and is bent before undergoing concerted break-up. It is also observed that different geometric configurations of the CS2(2+) precursor result in different kinetic energy release values.

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Ionization and fragmentation of OCS and CS2 after photoexcitation around the sulfur 2p edge

Cited by 26 publications

References 34 publications

Impulsive laser-induced alignment of OCS molecules at FERMI

Impulsive laser-induced alignment of OCS molecules at FERMI

Cationic Rydberg states observed in resonantly enhanced electron spectra of CS2

Three body dissociation of ${\rm CS}_2^{2+}$CS22+ subsequent to various S(2p) Auger transitions

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