The Experts below are selected from a list of 11493 Experts worldwide ranked by ideXlab platform
V M Shabaev - One of the best experts on this subject based on the ideXlab platform.
-
photoelectron spectra after multiphoton ionization of li atoms in the one photon rabi flopping regime
Physical Review A, 2019Co-Authors: D A Tumakov, Dmitry A Telnov, G Plunien, V M ShabaevAbstract:We calculate two-dimensional photoelectron momentum distributions and energy spectra after multiphoton ionization of Li atoms subject to intense laser fields in the one-photon Rabi-flopping regime. The time-dependent Schr\"odinger equation is solved within the single-active-electron approximation using a model potential which reproduces accurately the binding energies and dipole matrix elements of the Li atom. Interaction with the external electromagnetic field is treated within the dipole approximation. We show that the Rabi oscillations of the population between the ground $2s$ state and the excited $2p$ state in the one-photon resonance regime are reflected in the energy spectra of emitted Photoelectrons, which manifest interference structures with minima. Transformations of the interference structures in the photoelectron energy spectra caused by the variation of the laser peak intensity and pulse duration are analyzed.
Yunquan Liu - One of the best experts on this subject based on the ideXlab platform.
-
laser wavelength and intensity dependence of electron nuclear energy sharing in dissociative ionization of h 2
Physical Review A, 2020Co-Authors: Hao Liang, Yunquan Liu, Mingming Liu, Liangyou PengAbstract:We experimentally and theoretically study the photoelectron-nuclear energy sharing mechanism of the correlated dynamics between the Photoelectrons and the fragmented ions in the dissociative ionization of ${\mathrm{H}}_{2}$ with respect to the laser intensity at the wavelengths $\ensuremath{\lambda}=395\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$ and $\ensuremath{\lambda}=790\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$. We show that the prominent photoelectron-nuclear energy sharing along the back-diagonal lines is only observed for 395 nm at lower intensities, which is absent for increased intensities at 395 nm and for 790 nm lasers over a wide range of intensities. Based on a quantum mechanical model that includes the correlation between the photoelectron and the parent ion, we show that bond hardening has a significant effect on the photoelectron-nuclear energy sharing. The resonant states of the neutral hydrogen molecule during strong-field ionization and the distribution of vibrational states of molecular ions determine the joint energy spectrum of Photoelectrons and nuclei. The study provides an intuitive and comprehensive description and understanding of the correlated photoelectron-nuclear dynamics in the dissociative ionization.
-
energy resolved ultrashort delays of photoelectron emission clocked by orthogonal two color laser fields
Physical Review Letters, 2017Co-Authors: Xiaochun Gong, Yunquan Liu, Wenbin Zhang, Kang Lin, Cheng Lin, Qiying Song, Heping Zeng, Weifeng YangAbstract:A phase-controlled orthogonal two-color (OTC) femtosecond laser pulse is employed to probe the time delay of photoelectron emission in the strong-field ionization of atoms. The OTC field spatiotemporally steers the emission dynamics of the Photoelectrons and meanwhile allows us to unambiguously distinguish the main and sideband peaks of the above-threshold ionization spectrum. The relative phase shift between the main and sideband peaks, retrieved from the phase-of-phase of the photoelectron spectrum as a function of the laser phase, gradually decreases with increasing electron energy, and becomes zero for the fast electron which is mainly produced by the rescattering process. Furthermore, a Freeman resonance delay of 140±40 attoseconds between Photoelectrons emitted via the 4f and 5p Rydberg states of argon is observed.
-
characteristic spectrum of very low energy photoelectron from above threshold ionization in the tunneling regime
Physical Review Letters, 2012Co-Authors: Yudong Yang, Yunquan Liu, Qihuang Gong, X Liu, Xiaolei Hao, Jing ChenAbstract:We report an experimental and theoretical study of very low-energy Photoelectrons in tunneling ionization process from noble gas atoms interacting with ultrashort intense infrared laser pulses. A universal peak structure with electron energy well below 1 eV in the photoelectron spectrum, corresponding to the double-hump structure in the longitudinal momentum distribution, is identified experimentally for all atomic species. Our quantum and semiclassical analysis reveal the role of long-range Coulomb potential in the production of this very low-energy peak structure.
B C Walker - One of the best experts on this subject based on the ideXlab platform.
-
relativistic mev Photoelectrons from the single atom response of argon to a 10 19 w cm2 laser field
Physical Review Letters, 2008Co-Authors: A Dichiara, Isaac Ghebregziabher, Rob Sauer, J Waesche, S Palaniyappan, B C WalkerAbstract:We present photoelectron measurements from argon ionization at 10{sup 19} W/cm{sup 2}. Photoelectrons with energies above 400 keV, including a 1.2 MeV cutoff, are in quantitative agreement with a semiclassical, relativistic 3D ionization model that includes a nonparaxial laser field. L-shell Photoelectrons have energies and momentum dominated by the field, including the acceleration out of the focus. Yields and angular distributions at 60 keV come from valence shell ionization by strong fields where rescattering and atomic processes determine photoelectron final states.
-
relativistic mev Photoelectrons from the single atom response of argon to a 10 19 w cm 2 laser field
Physical Review Letters, 2008Co-Authors: A Dichiara, Isaac Ghebregziabher, Rob Sauer, J Waesche, S Palaniyappan, B L Wen, B C WalkerAbstract:We present photoelectron measurements from argon ionization at 10{sup 19} W/cm{sup 2}. Photoelectrons with energies above 400 keV, including a 1.2 MeV cutoff, are in quantitative agreement with a semiclassical, relativistic 3D ionization model that includes a nonparaxial laser field. L-shell Photoelectrons have energies and momentum dominated by the field, including the acceleration out of the focus. Yields and angular distributions at 60 keV come from valence shell ionization by strong fields where rescattering and atomic processes determine photoelectron final states.
Satoshi Tanaka - One of the best experts on this subject based on the ideXlab platform.
-
recoil effect of Photoelectrons in the fermi edge of simple metals
Physical Review Letters, 2008Co-Authors: Yasutaka Takata, Yosuke Kayanuma, Makina Yabashi, Kenji Tamasaku, Yoshinori Nishino, Satoshi Tanaka, S Oshima, Masaharu Matsunami, Ritsuko Eguchi, A ChainaniAbstract:High energy resolution photoelectron spectroscopy of conduction electrons in the vicinity of the Fermi edge in Al and Au at excitation energies of 880 and 7940 eV was carried out using synchrotron radiation. For the excitation energy of 7940 eV, the observed Fermi energy of Al shows a remarkable shift to higher binding energy as compared with that of Au, with accompanying broadening. This is due to the recoil effect of the emitted Photoelectrons. The observed spectra are well reproduced by a simple model of Bloch electrons based on the isotropic Debye model.
-
Recoil effects of Photoelectrons in a solid
Physical Review B, 2007Co-Authors: Yasutaka Takata, Yosuke Kayanuma, Makina Yabashi, Kenji Tamasaku, Yoshinori Nishino, Daigo Miwa, Yoshihisa Harada, Koji Horiba, Shik Shin, Satoshi TanakaAbstract:High-energy-resolution $\mathrm{C}\phantom{\rule{0.2em}{0ex}}1s$ photoelectron spectra of graphite were measured at excitation energies of 340, 870, 5950, and $7940\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ using synchrotron radiation. On increasing the excitation energy, i.e., increasing kinetic energy of the photoelectron, the bulk origin $\mathrm{C}\phantom{\rule{0.2em}{0ex}}1s$ peak position shifts to higher binding energies. This systematic shift is due to the kinetic-energy loss of the high-energy photoelectron by kicking the atom and is clear evidence of the recoil effect in photoelectron emission. It is also observed that the asymmetric broadening increases for the higher-energy Photoelectrons. All these recoil effects can be quantified in the same manner as the M\"ossbauer effect for $\ensuremath{\gamma}$-ray emission from nuclei embedded in crystals.
Yasutaka Takata - One of the best experts on this subject based on the ideXlab platform.
-
recoil effect of Photoelectrons in the fermi edge of simple metals
Physical Review Letters, 2008Co-Authors: Yasutaka Takata, Yosuke Kayanuma, Makina Yabashi, Kenji Tamasaku, Yoshinori Nishino, Satoshi Tanaka, S Oshima, Masaharu Matsunami, Ritsuko Eguchi, A ChainaniAbstract:High energy resolution photoelectron spectroscopy of conduction electrons in the vicinity of the Fermi edge in Al and Au at excitation energies of 880 and 7940 eV was carried out using synchrotron radiation. For the excitation energy of 7940 eV, the observed Fermi energy of Al shows a remarkable shift to higher binding energy as compared with that of Au, with accompanying broadening. This is due to the recoil effect of the emitted Photoelectrons. The observed spectra are well reproduced by a simple model of Bloch electrons based on the isotropic Debye model.
-
Recoil effects of Photoelectrons in a solid
Physical Review B, 2007Co-Authors: Yasutaka Takata, Yosuke Kayanuma, Makina Yabashi, Kenji Tamasaku, Yoshinori Nishino, Daigo Miwa, Yoshihisa Harada, Koji Horiba, Shik Shin, Satoshi TanakaAbstract:High-energy-resolution $\mathrm{C}\phantom{\rule{0.2em}{0ex}}1s$ photoelectron spectra of graphite were measured at excitation energies of 340, 870, 5950, and $7940\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ using synchrotron radiation. On increasing the excitation energy, i.e., increasing kinetic energy of the photoelectron, the bulk origin $\mathrm{C}\phantom{\rule{0.2em}{0ex}}1s$ peak position shifts to higher binding energies. This systematic shift is due to the kinetic-energy loss of the high-energy photoelectron by kicking the atom and is clear evidence of the recoil effect in photoelectron emission. It is also observed that the asymmetric broadening increases for the higher-energy Photoelectrons. All these recoil effects can be quantified in the same manner as the M\"ossbauer effect for $\ensuremath{\gamma}$-ray emission from nuclei embedded in crystals.