A5002403587- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Porphyrin and Phthalocyanine Chemistry
- Spectroscopy and Quantum Chemical Studies
- Fullerene Chemistry and Applications
- Dark Matter and Cosmic Phenomena
- Photosynthetic Processes and Mechanisms
- Astrophysics and Cosmic Phenomena
- Photochemistry and Electron Transfer Studies
- Laser Design and Applications
- Supramolecular Chemistry and Complexes
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- Photochromic and Fluorescence Chemistry
- Nuclear Physics and Applications
- Hemoglobin structure and function
- High Entropy Alloys Studies
- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced materials and composites
- Metal Alloys Wear and Properties
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
Osaka Metropolitan University
2024
The University of Tokyo
2008-2023
Osaka City University
2022
Tohoku University
2001-2008
Ai Corporation (United Kingdom)
2007
Magnetic circular dichroism (MCD) spectroscopy has widely been applied to porphyrins and phthalocyanines since around 1970, in order elucidate their electronic structures. In this mini-review, some representative MCD results from the author's laboratory over past 30 years are introduced, together with recent other laboratories. studies on following monomeric species included: D4h type, adjacent vs. opposite type diaromatic ring-fused, non-planar, reduced oxidized species, as well showing...
Abstract When hydrocarbon molecules are exposed to an intense laser field, triatomic hydrogen molecular ion, H 3 + , is ejected. Here we describe pump–probe measurements of the ejection from methanol dication with high temporal resolution using few-cycle pulses and find a long-lasting periodic increase in yield . We show that lowest energy decomposition channel its enhanced each time when vibrational wave packet coming back inner turning point cation projected onto potential surface. also...
We report an estimation of the injected mass composition ultrahigh energy cosmic rays (UHECRs) at energies higher than 10 EeV. The is inferred from energy-dependent sky distribution UHECR events observed by Telescope Array surface detector comparing it to Large Scale Structure local Universe. In case negligible extragalactic magnetic fields (EGMFs), results are consistent with a relatively heavy E∼10 EeV that becomes lighter up E∼100 EeV, while E>100 very heavy. latter true even in presence...
The ejection of triatomic hydrogen molecular ions HD2(+) and D3(+) from CD3OH(2+) is investigated by first-principle dynamics simulation. Two C-D chemical bonds are found to be broken form a neutral D2 moiety that vibrates, rotates, moves for relatively long period time (20-330 fs) towards transition state leading the or D3(+). formation such long-lived within hydrocarbon molecule interprets well recent experimental findings lifetime doubly charged energized molecules prior H3(+).
Hydrogen migration in methanol induced by an intense laser field (0.2 PW/cm2) is investigated real time a pump-probe coincidence momentum imaging method. The observed temporal evolution of the kinetic energy spectra reveals that there are two distinctively different stages hydrogen processes singly charged methanol: ultrafast occurring within (∼38 fs) and slower postlaser pulse (∼150 fs).
Abstract We have developed a method for describing the reaction dynamics of polyatomic molecule in intense laser fields. First, dynamical behavior H2+ and H2 near-infrared, fields (I > 1013 W cm−2 λ 700 nm) was examined; accurate evaluation electronic nuclear wave packet achieved by dual transformation that we developed. Using “field-following” time-dependent adiabatic states defined as eigenfunctions “instantaneous” Hamiltonian, clarified bound electrons, ionization processes,...
Abstract Electronic absorption, magnetic circular dichroism (MCD), IR spectra, and cyclic differential pulse voltammograms of metal‐free copper monoaza‐ opposite diazaporphyrins are reported, together with molecular orbital (MO) calculations using the density functional theory (DFT) method. Introduction nitrogen atoms at meso position porphyrins caused a blue‐shift B band red‐shift Q band, concomitant decrease increase apparent absorption coefficient, respectively. On going from monoaza to...
Ultrafast proton migration in 1,3-butadiene an intense laser field (40 fs, 4.5 × 1014 W cm−2) is investigated by using Coulomb explosion coincidence momentum imaging. The spatial distribution maps of a migrating reconstructed for the two three-body pathways, C4H63+ → H+ + CH3+ C3H2+ and C2H+ C2H4+, reveal that protons migrate within molecule, prior to three body decomposition.
Oxotitanium(IV) phthalocyanine (OTiPc) has been reported to be a near-IR-active photoconductor, where crystal modifications termed phases I, II, and Y exist. In this paper, solid-state electronic absorption spectra of OTiPc have theoretically calculated by considering three origins (i.e., exciton, charge transfer (CT), molecular distortion) clarify the form dependence on large red shift Q band high photoconductivity photoactive phase II in particular. these calculations, intermolecular...
Using the framework of multiconfiguration theory, where wavefunction Φ(t) a many-electron system at time t is expanded as $\Phi (t) = \sum\nolimits_I {C_I (t)\Phi _I (t)} $Φ(t)=∑ICI(t)ΦI(t) in terms electron configurations {ΦI(t)}, we divided total electronic energy E(t) $E \sum\nolimits_I\vert (t)\vert^2 E_I $E(t)=∑I|CI(t)|2EI(t) . Here EI(t) instantaneous phase changes CI(t) regarded configurational associated with ΦI(t). We then newly defined two types time-dependent states: (i) state...
We theoretically investigated the stability of highly charged C60z+ cations produced from C60 with an ultrashort intense laser pulse λ∼1800nm. first calculated equilibrium structures and vibrational frequencies as well C60. then key energies relevant to dissociation C60z+, such excess energy acquired upon sudden tunnel ionization By comparing magnitudes energies, we found that up z∼12 can be a stable or quasistable (microsecond-order lifetime) intact parent cation, in agreement recent...
Impulsive Raman excitation of C(60) by single or double pulses near-infrared wavelength λ = 1800 nm was investigated using a time-dependent adiabatic state approach combined with the density functional theory method. We confirmed that vibrational energy stored in active mode is maximized when T(p) ~ T(vib)/2 case pulse, where pulse length and T(vib) period mode. In selective can be achieved adjusting interval τ. The if τ chosen to equal an integer multiple it minimized half-integer T(vib)....
Both the size and symmetry of π-conjugated systems change during dehydrogenation/hydrogenation cycles a phthalocyanine analogue fused with four cycloheptatriene rings (see picture, R=H or Ph).
By using time-dependent density functional theory, we calculated the transition energies of a zinc porphyrin monomer and its meso−meso-linked arrays. In line with prediction molecular exciton model, splitting energy Soret band increased as number linked porphyrins increased. We then examined how dimer array were shifted by an applied electric field. For reproduction electroabsorption spectrum (EA), i.e., field-induced change in absorption intensity, model Hamiltonian constructed from five...