Photodissociation of alkyl iodides in helium nanodroplets. I. Kinetic energy transfer

Braun, A.; Drabbels, Marcel

doi:10.1063/1.2767261

Cited by 55 publications

(69 citation statements)

References 75 publications

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“…In contrast to the mean kinetic energy releases, the angular distributions show no significant difference in the medium size droplets even though the anisotropic parameters from the doped helium droplets photodissociation are significantly lower than that from the averaged gas phase value. Previous studies indicate that the speed and angular relaxations are strongly mass dependent, which are simulated by classical Monte Carlo calculations based on a binary hard-sphere scattering model [15]. Qualitatively the present experimental results agree well with the previous results.…”

Section: µSsupporting

confidence: 82%

“…By electron bombardment ionizing the helium atoms followed by the charge transfer to ion-ize the reactants, they studied N 2 + +D 2 and CH 4 + +D 2 reactions which are more related to chemistry in interstellar medium and upper atmosphere [39]. More recently, the photodissociation dynamics in the helium droplets has been studied by Braun et al They studied the photodissociation of CH 3 I, CF 3 I, and C 2 H 5 I in helium droplets where the signal were detected by the velocity mapping ion imaging (VMI) technique [15,16]. The translational energy distributions and angular distributions show significant difference with the gas phase results.…”

Section: Introductionmentioning

confidence: 99%

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Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Zhang

Huang

et al. 2013

Chinese Journal of Chemical Physics

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A new pulsed helium nano droplets machine has been constructed. The droplets were generated by expansion of the pure helium through the cryogenic valve attached to a closed-cycle cryostat. The mean size of helium droplets can be controlled between 10 3 and 10 5 helium atoms by tuning the backing pressure (10−40 bar) and temperature (10−30 K). Compared with the continuous-flow beam source, the density of droplet is at least one order of magnitude higher, which offers the opportunity to combine the system with the commercial pulsed laser to study chemical reactions inside of the superfluid helium at ultra-low temperature. The performance for the system has been checked by studying the photodissociation of CH 3 I doped droplets at 252 nm with the velocity map imaging technique. The photofragments, CH 3 , were detected by (2+1) resonance enhanced multiphoton ionization. The speed and angular distributions derived from resulting images show clear evidence of the relaxation effect by the surrounding helium atoms. The pulsed helium droplets depletion spectroscopy was also demonstrated. The depletion spectrum of benzene doped helium droplets indicates that less than 3% depletion can be observed with the newly constructed apparatus.

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Section: µSsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Zhang

Huang

et al. 2013

Chinese Journal of Chemical Physics

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“…25,26 Briefly, helium droplets consisting on average of 1000-20 000 helium atoms are produced by expanding high purity helium gas at a stagnation pressure of 30 bars into vacuum through a 5 μm nozzle that is cooled to temperatures in the range of 11-22 K. 27 The helium droplets pick up molecules by inelastic collisions, as they pass through a vapor of the molecule of interest. The vapor pressure is adjusted to maximize the pickup of a single molecule.…”

Section: Methodsmentioning

confidence: 99%

Mid-infrared spectroscopy of molecular ions in helium nanodroplets

Zhang

Bräuer

Berden

et al. 2012

The Journal of Chemical Physics

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Vibrational energy relaxation of benzene dimer and trimer in the CH stretching region studied by picosecond time-resolved IR-UV pump-probe spectroscopy J. Chem. Phys. 136, 044304 (2012) Influence of the cluster dimensionality on the binding behavior of CO and O2 on Au13 J. Chem. Phys. 136, 024312 (2012) Core-to-Rydberg band shift and broadening of hydrogen bonded ammonia clusters studied with nitrogen K-edge excitation spectroscopy J. Chem. Phys. 136, 014308 (2012) Theoretical characterization of intermolecular vibrational states through the multi-configuration time dependent Hartree approach: The He2,3ICl clusters J. Chem. Phys. 135, 244309 (2011) Studies on the structure, stability, and spectral signatures of hydride ion-water clusters J. Chem. Phys. 135, 214308 (2011) Additional information on J. Chem. Phys. High resolution IR spectra of aniline, styrene, and 1,1-diphenylethylene cations embedded in superfluid helium nanodroplets have been recorded in the 300-1700 cm −1 range using a free-electron laser as radiation source. Comparison of the spectra with available gas phase data reveals that the helium environment induces no significant matrix shift nor leads to an observable line broadening of the resonances. In addition, the IR spectra have provided new and improved vibrational transition frequencies for the cations investigated, as well as for neutral aniline and styrene. Indications have been found that the ions desolvate from the droplets after excitation by a non-evaporative process in which they are ejected from the helium droplets. The kinetic energy of the ejected ions is found to be ion specific and to depend only weakly on the excitation energy.

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“…[1][2][3] Today, clusters of 4 He atoms are probably best known for their use as a superfluid host that enables spectroscopic studies on regular and exotic species at temperatures of ~0.4 K. [4][5][6][7][8][9][10][11][12] He droplets exhibit a unique combination of cryogenic temperatures, superfluidity, nanoscale dimensions, excellent dopant pickup capability, high effective heat capacity, and high electronic excitation energies. These properties continue to inspire a range of proven and proposed applications, from providing nano-scale reaction chambers 13,14 to hosting biological samples in ultrafast single shot diffractive imaging experiments at 4th…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Dynamics in Helium Nanodroplets Probed by Femtosecond Time-Resolved EUV Photoelectron Imaging

et al. 2009

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The dynamics of electronically excited helium nanodroplets are studied by femtosecond time-resolved photoelectron imaging. EUV excitation into a broad absorption band centered around 23.8 eV leads to an indirect photoemission process that generates ultraslow photoelectrons. A 1.58 eV probe pulse transiently depletes the indirect photoemission signal for pump-probe time delays <200 fs and enhances the signal beyond this delay. The depletion is due to suppression of the indirect ionization process by the probe photon, which generates a broad, isotropically emitted photoelectron band. Similar time scales in the decay of the high energy photoelectron signal and the enhancement of the indirect photoemission signal suggest an internal relaxation process that populates states in the range of a lower energy droplet absorption band located just below the droplet ionization potential (IP~23.0 eV). A nearly 70% enhancement of the

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Photodissociation of alkyl iodides in helium nanodroplets. I. Kinetic energy transfer

Cited by 55 publications

References 75 publications

Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Mid-infrared spectroscopy of molecular ions in helium nanodroplets

Ultrafast Dynamics in Helium Nanodroplets Probed by Femtosecond Time-Resolved EUV Photoelectron Imaging

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