The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform
Andre T J B Eppink - One of the best experts on this subject based on the ideXlab platform.
-
photoelectron and photofragment velocity map imaging of state selected molecular oxygen dissociation Ionization dynamics
Journal of Chemical Physics, 1997Co-Authors: David H Parker, Andre T J B EppinkAbstract:A substantial improvement in the photofragment imaging technique is illustrated in a study of molecular oxygen photodynamics. In this method, labeled velocity map imaging, electrostatic ion lenses are shown to allow mapping of all particles with the same initial velocity vector onto the same point on a 2D detector, irrespective of their position of creation in the Ionization Volume. This leads to a dramatic increase in image resolution. Velocity map imaging of photoelectrons from molecular Ionization is also demonstrated and applied along with O+ imaging to identify the processes leading to O+ formation when using (2+1) resonantly enhanced multiphoton Ionization (REMPI) detection for O2. Oxygen molecules prepared in the (v=2, N=2) level of the 3dπ(3Σ1g−) Rydberg state by two-photon excitation at 11.02 eV are excited by a third photon to an energy near v=24 of ground-state O2+ (equivalent to one-photon excitation at 75 nm). All energetically accessible excited oxygen atoms and an extensive range of vibrati...
-
Photoelectron and photofragment velocity map imaging of state-selected molecular oxygen dissociation/Ionization dynamics
The Journal of Chemical Physics, 1997Co-Authors: David H Parker, Andre T J B EppinkAbstract:A substantial improvement in the photofragment imaging technique is illustrated in a study of molecular oxygen photodynamics. In this method, labeled velocity map imaging, electrostatic ion lenses are shown to allow mapping of all particles with the same initial velocity vector onto the same point on a 2D detector, irrespective of their position of creation in the Ionization Volume. This leads to a dramatic increase in image resolution. Velocity map imaging of photoelectrons from molecular Ionization is also demonstrated and applied along with O+ imaging to identify the processes leading to O+ formation when using (2+1) resonantly enhanced multiphoton Ionization (REMPI) detection for O2. Oxygen molecules prepared in the (v=2, N=2) level of the 3dπ(3Σ1g−) Rydberg state by two-photon excitation at 11.02 eV are excited by a third photon to an energy near v=24 of ground-state O2+ (equivalent to one-photon excitation at 75 nm). All energetically accessible excited oxygen atoms and an extensive range of vibrati...
David H Parker - One of the best experts on this subject based on the ideXlab platform.
-
photoelectron and photofragment velocity map imaging of state selected molecular oxygen dissociation Ionization dynamics
Journal of Chemical Physics, 1997Co-Authors: David H Parker, Andre T J B EppinkAbstract:A substantial improvement in the photofragment imaging technique is illustrated in a study of molecular oxygen photodynamics. In this method, labeled velocity map imaging, electrostatic ion lenses are shown to allow mapping of all particles with the same initial velocity vector onto the same point on a 2D detector, irrespective of their position of creation in the Ionization Volume. This leads to a dramatic increase in image resolution. Velocity map imaging of photoelectrons from molecular Ionization is also demonstrated and applied along with O+ imaging to identify the processes leading to O+ formation when using (2+1) resonantly enhanced multiphoton Ionization (REMPI) detection for O2. Oxygen molecules prepared in the (v=2, N=2) level of the 3dπ(3Σ1g−) Rydberg state by two-photon excitation at 11.02 eV are excited by a third photon to an energy near v=24 of ground-state O2+ (equivalent to one-photon excitation at 75 nm). All energetically accessible excited oxygen atoms and an extensive range of vibrati...
-
Photoelectron and photofragment velocity map imaging of state-selected molecular oxygen dissociation/Ionization dynamics
The Journal of Chemical Physics, 1997Co-Authors: David H Parker, Andre T J B EppinkAbstract:A substantial improvement in the photofragment imaging technique is illustrated in a study of molecular oxygen photodynamics. In this method, labeled velocity map imaging, electrostatic ion lenses are shown to allow mapping of all particles with the same initial velocity vector onto the same point on a 2D detector, irrespective of their position of creation in the Ionization Volume. This leads to a dramatic increase in image resolution. Velocity map imaging of photoelectrons from molecular Ionization is also demonstrated and applied along with O+ imaging to identify the processes leading to O+ formation when using (2+1) resonantly enhanced multiphoton Ionization (REMPI) detection for O2. Oxygen molecules prepared in the (v=2, N=2) level of the 3dπ(3Σ1g−) Rydberg state by two-photon excitation at 11.02 eV are excited by a third photon to an energy near v=24 of ground-state O2+ (equivalent to one-photon excitation at 75 nm). All energetically accessible excited oxygen atoms and an extensive range of vibrati...
Koichiro Mitsuke - One of the best experts on this subject based on the ideXlab platform.
-
Velocity map imaging apparatus applicable to a study of multiple photofragmentation of C60
Chemical Physics Letters, 2008Co-Authors: Serajul I. Prodhan, Hideki Katayanagi, Chaoqun Huang, Hajime Yagi, Bhim P. Kafle, Koichiro MitsukeAbstract:Abstract A velocity map imaging (VMI) spectrometer was constructed for observation of the slow ions produced by photofragmentation of C 60 with synchrotron radiation. The spectrometer was tested by observing the ion images of rare gases in the Maxwell–Boltzmann distribution at room temperature, and the effect of a large Ionization Volume inevitable in our experiment has been quantitatively characterized. Numerical simulations taking into account such instrumental parameters indicate that one can distinguish the two independent formation processes of C 56 + from the primary precursor C 60 + : i.e., one-step ejection of C 4 and sequential ejections of two C 2 fragments.
Serajul I. Prodhan - One of the best experts on this subject based on the ideXlab platform.
-
Velocity map imaging apparatus applicable to a study of multiple photofragmentation of C60
Chemical Physics Letters, 2008Co-Authors: Serajul I. Prodhan, Hideki Katayanagi, Chaoqun Huang, Hajime Yagi, Bhim P. Kafle, Koichiro MitsukeAbstract:Abstract A velocity map imaging (VMI) spectrometer was constructed for observation of the slow ions produced by photofragmentation of C 60 with synchrotron radiation. The spectrometer was tested by observing the ion images of rare gases in the Maxwell–Boltzmann distribution at room temperature, and the effect of a large Ionization Volume inevitable in our experiment has been quantitatively characterized. Numerical simulations taking into account such instrumental parameters indicate that one can distinguish the two independent formation processes of C 56 + from the primary precursor C 60 + : i.e., one-step ejection of C 4 and sequential ejections of two C 2 fragments.
K Codling - One of the best experts on this subject based on the ideXlab platform.
-
The effect of truncating a Gaussian beam on the yields of multiply charged ions
Journal of Physics B: Atomic Molecular and Optical Physics, 1994Co-Authors: L. Zhang, L J Frasinski, K CodlingAbstract:The intensity distribution in the focal region of a laser beam is calculated for a Gaussian profile truncated by a circular aperture. The results give the theoretical Ionization Volume as a function of the laser intensity and this allows calculation of the multiple Ionization of atoms by an intense laser. As an example, the yields of multiply charged ions of xenon are calculated for focused intensities in the range 1013 to 1016 W cm-2. Oscillations in the yield curves are produced, with an implication that this behaviour may explain some experimental observations.