Superexcited State Dynamics Probed with an Extreme-Ultraviolet Free Electron Laser

Li, Wen; Lucchese, Robert R.; Doyuran, A.; Wu, Zhen; Loos, H.; Hall, Gregory E.; Suits, Arthur G.

doi:10.1103/physrevlett.92.083002

Cited by 36 publications

(34 citation statements)

References 24 publications

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“…The energy values are taken from Refs. 39 and 22, respectively. In iodomethane, one UV photon of 267 nm predominantly triggers a resonant neutral dissociation into CH 3 and I*.…”

Section: Introductionmentioning

confidence: 99%

Charge transfer in dissociating iodomethane and fluoromethane molecules ionized by intense femtosecond X-ray pulses

Boll

Erk

Coffee

et al. 2016

Structural Dynamics

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Ultrafast electron transfer in dissociating iodomethane and fluoromethane molecules was studied at the Linac Coherent Light Source free-electron laser using an ultraviolet-pump, X-ray-probe scheme. The results for both molecules are discussed with respect to the nature of their UV excitation and different chemical properties. Signatures of long-distance intramolecular charge transfer are observed for both species, and a quantitative analysis of its distance dependence in iodomethane is carried out for charge states up to I21+. The reconstructed critical distances for electron transfer are in good agreement with a classical over-the-barrier model and with an earlier experiment employing a near-infrared pump pulse.

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“…The energy values are taken from Refs. 39 and 22, respectively. In iodomethane, one UV photon of 267 nm predominantly triggers a resonant neutral dissociation into CH 3 and I*.…”

Section: Introductionmentioning

confidence: 99%

Charge transfer in dissociating iodomethane and fluoromethane molecules ionized by intense femtosecond X-ray pulses

Boll

Erk

Coffee

et al. 2016

Structural Dynamics

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“…With the recent development of intense and ultrashort-wavelength free-electron lasers [32][33][34], the study of multiphoton * zyzhou@ku.edu † sichu@ku.edu processes in the high-frequency and strong-field regime becomes increasingly important [35][36][37]. In such a regime, the electron can achieve very high energy by absorbing photons from the fields and can go very far from the nucleus.…”

Section: Introductionmentioning

confidence: 99%

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Zhou

Chu

2011

Phys. Rev. A

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We present an approach in momentum (P) space for the accurate study of multiphoton and above-threshold ionization (ATI) dynamics of atomic systems driven by intense laser fields. In this approach, the electron wave function is calculated by solving the P-space time-dependent Schrödinger equation (TDSE) in a finite P-space volume under a simple zero asymptotic boundary condition. The P-space TDSE is propagated accurately and efficiently by means of the time-dependent generalized pseudospectral method with optimal momentum grid discretization and a split-operator time propagator in the energy representation. The differential ionization probabilities are calculated directly from the continuum-state wave function obtained by projecting the total electron wave function onto the continuum-state subspace using the projection operator constructed by the continuum eigenfunctions of the unperturbed Hamiltonian. As a case study, we apply this approach to the nonperturbative study of the multiphoton and ATI dynamics of a hydrogen atom exposed to intense shortwavelength laser fields. High-resolution photoelectron energy-angular distribution and ATI spectra have been obtained. We find that with the increase of the laser intensity, the photoelectron energy-angular distribution changes from circular to dumbbell shaped and is squeezed along the laser field direction. We also explore the change of the maximum photoelectron energy with laser intensity and strong-field atomic stabilization phenomenon in detail.

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“…With the recent development of free-electron lasers (FELs), particularly the "fourth-generation" accelerator-based FELs [1][2][3], the study of multiphoton processes of atoms and molecules in superintense ultrashort-wavelength and x-ray laser fields is attracting more and more attention [4][5][6][7][8][9]. Theoretical investigation of the multiphoton processes in superintense and ultrashort-wavelength laser fields may encounter twofold difficulties.…”

Section: Introductionmentioning

confidence: 99%

Multiphoton above-threshold ionization in superintense free-electron x-ray laser fields: Beyond the dipole approximation

Zhou

Chu

2013

Phys. Rev. A

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We present an accurate and efficient nondipole computational approach in momentum space for the nonperturbative study of multiphoton above-threshold ionization (ATI) of atoms in superintense and ultrashortwavelength laser fields. This approach has been successfully used to investigate the multiphoton processes of a hydrogen atom exposed to superintense free-electron x-ray laser fields. We find that, compared to results of the dipole approximation, the nondipole ATI spectra are enhanced substantially in the high-energy regime, and the photoelectron angular distributions are distorted significantly in higher-intensity and/or longer-pulse laser fields; in particular two lobes are induced, one along and one against the laser propagation direction. The origin of these phenomena has been explored in detail.

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Superexcited State Dynamics Probed with an Extreme-Ultraviolet Free Electron Laser

Cited by 36 publications

References 24 publications

Charge transfer in dissociating iodomethane and fluoromethane molecules ionized by intense femtosecond X-ray pulses

Charge transfer in dissociating iodomethane and fluoromethane molecules ionized by intense femtosecond X-ray pulses

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Multiphoton above-threshold ionization in superintense free-electron x-ray laser fields: Beyond the dipole approximation

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