The easternmost record of Macratriinae LeConte, 1862 (Coleoptera: Anthicidae), with a new species from Fiji and a genus-rank synonymy in Macratriini LeConte, 1862

The easternmost record of Macratria Newman, 1838 from Fiji is presented, and M. fijiana sp. nov. is described and illustrated. Biogeographical patterns and diversity of Pacific Macratriinae are briefly discussed. Additionally, a new genus rank synonymy in Macratriinae is proposed: Thambospasta Werner, 1974 syn. nov. of Salimuzzamania Abdullah, 1968. New combination is made for Salimuzzamania howdeni (Werner, 1974) comb. nov. (from Thambospasta).Copyright © 2021, Magnolia Press. This is an article published under a Creative Commons BY-NC-ND license: https://creativecommons.org/licenses/by-nc-nd/3.0/. The attached file is the published version of the article.NHM Repositor

Nomenclatural notes on Anthicidae and Pyrochroidae (Coleoptera). 6

Five new combinations, three new synonyms and two new statuses for the Anthicidae are proposed. New distributional data or corrections are provided on 65 taxa of Pyrochroidae and Anthicidae. Eighteen new species and subspecies are described: Anthelephila panayensis sp. nov., Anthicus (s. str.) chitwanus sp. nov., A. (s. str.) lepcha sp. nov., A. (s. str.) vicinor sp. nov., Aulacoderus muehlei sp. nov., Clavicomus garze sp. nov., C. kham sp. nov., Cyclodinus phragmiteticola sp. nov., Macratria dotyali sp. nov., M. kopetzi sp. nov., M. leprieuri gasconica ssp. nov., Macratriomima casuarius sp. nov., M. chandleri sp. nov., Notoxus reuteri sp. nov., Rimaderus bonadonai sp. nov., R. sahyadri sp. nov., Stenidius obliquesetosus sp. nov., and Tomoderus schmidti sp. nov. Additional description is given for Anthelephila kresli Kejval, 2007 and Yunnanomonticola Telnov, 2002.Baltic Journal of Coleopterology is a free access magazine. The attached file is the published pdf. http://www.bjc.sggw.pl/viewart.php?bookid=37&artid=63

Descriptions of two new Australian genera of Anthicidae (Insecta: Coleoptera)

Two new Australian Anthicidae genera, Australosteropes gen. nov. (Steropinae) and Sahulanthicus gen. nov. (Anthicinae: Anthicini) are described, diagnosed, and illustrated. Some critical morphological characters of these new groups and the subfamilies to which they belong are discussed. New combinations are made for the following 18 taxa: Australosteropes davidsonae (Armstrong, 1948) comb. nov. (from Macratria Newman, 1838), Sahulanthicus abundans (Lea, 1922) comb. nov., S. apicalis (King, 1869) comb. nov., S. baudinensis (Champion, 1895) comb. nov., S. brevicollis (King, 1869) comb. nov., S. cavifrons (Champion, 1895) comb. nov., S. crassipes (LaFerté-Sénectère, 1849) comb. nov., S. crassus (King, 1869) comb. nov., S. discoideus (Champion, 1895) comb. nov., S. immaculatus (King, 1869) comb. nov., S. inglorius (Lea, 1896) comb. nov., S. laticollis (MacLeay, 1872) comb. nov., S. luridus (King, 1869) comb. nov., S. monostigma (Champion, 1895) comb. nov., S. obliquefasciatus (King, 1869) comb. nov., S. permutatus (Pic, 1897) comb. nov., S. scutellatus (Lea, 1896) comb. nov. (all from Microhoria Chevrolat, 1877), and S. dilatipennis (Pic, 1900) comb. nov. (from Anthicus Paykull, 1798). Lectotype is designated for Sahulanthicus dilatipennis (Pic, 1900).Baltic Journal of Coleopterology is a free access magazine. The attached file is the published pdf. http://www.bjc.sggw.pl/viewart.php?bookid=37&artid=63

Low-energy structure of above-threshold-ionization electron spectra: Role of the Coulomb threshold effect

This is the publishers version, also available here: http://dx.doi.org/10.1103/PhysRevA.83.063406.Recent experimental observations of above-threshold ionization of rare gas atoms and diatomic molecules by midinfrared laser fields [C. I. Blaga et al., Nat. Phys. 5, 335 (2009); W. Quan et al., Phys. Rev. Lett. 103, 093001 (2009)] revealed a prominent maximum in the electron energy spectrum very close to the ionization threshold which is not reproduced by widely used Keldysh-Faisal-Reiss theories. We have performed fully ab initio theoretical analysis and precision calculations to explore the quantum origin of the low-energy structure (LES) observed in the experiments. Our study shows that an important role in shaping of LES is played by the effect of Coulomb attraction in the final electron state and the Coulomb threshold effect

High-order perturbation expansion of non-Hermitian Floquet theory for multiphoton and above-threshold ionization processes

This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.61.013408.A high-order perturbation theory is presented for efficient and accurate computation of multiphoton and above-threshold ionization cross sections of atoms and molecules in weak to medium strength laser fields. The procedure is based on a Raleigh-Schrödinger perturbative expansion of the time-independent non-Hermitian Floquet Hamiltonian. The reduced Green function and generalized pseudospectral discretization techniques are extended to facilitate the calculation of complex quasienergy resonance states without the need of diagonalizing the full Floquet Hamiltonian. Explicit expressions are presented for the determination of intensity-dependent total and partial rates and electron angular distributions. The theory is applied to a case study of multiphoton detachment of H- for a range of laser frequencies (corresponding to the absorption of a minimum of two photons) and laser intensities from 107 to 1012W/cm2. It is found that a 16th-order perturbative Floquet procedure provides an excellent description of the two-photon-dominant detachment processes for laser intensity up to 2×1011W/cm2. The predicted electron angular distributions are in good agreement with recent experimental data

Multiphoton above-threshold detachment of Li-: Exterior-complex-scaling– generalized-pseudospectral method for calculations of complex-quasienergy resonances in Floquet formulation of time-dependent density-functional theory

This is the publisher's version, also available electronically from http://journals.aps.org/pra/abstract/10.1103/PhysRevA.66.043417.We extend the exterior-complex-scaling–generalized-pseudospectral (ECSGPS) method [D. A. Telnov and S. I. Chu, Phys. Rev. A 59, 2864 (1999)] to the nonperturbative calculations of complex-quasienergy resonances of many-electron quantum systems within the Floquet formulation of time-dependent density-functional theory (TDDFT) [D. A. Telnov and S. I. Chu, Chem. Phys. Lett. 264, 466 (1997)]. The ECSGPS technique appears very useful in TDDFT-Floquet calculations where the exchange-correlation potentials may exhibit quite complicated behavior as functions of the electron coordinates and cannot be easily treated by means of the uniform-complex-scaling techniques. We have applied this procedure to the study of one-photon detachment and two-photon dominant above-threshold detachment of Li- negative ions. In the one-photon case, the photodetachment cross section has been calculated as a function of the photon energy with results in good agreement with the experimental data. In the two-photon case, both the partial detachment rates and electron angular distributions for the dominant and above-threshold channels are presented for a range of laser field frequencies and intensities. Dramatic transformations of the angular distributions in the vicinity of the two-photon threshold are observed and analyzed

Exact relations of the quasienergy functional and the exchange-correlation potential from the Floquet formulation of time-dependent density functional theory

In the framework of the Floquet formulation of time-dependent density functional theory we present several exact relations involving different parts of the quasienergy functional. These relations hold when the exact densities and exchange-correlation energy functional are employed. They can be used as useful constraints and tests when searching for the approximate forms of the time-dependent exchange-correlation functionals. The general results are illustrated on an exactly soluble model, Hooke’s atom in a linearly polarized monochromatic laser field

Ab initio study of the orientation effects in multiphoton ionization and high-order harmonic generation from the ground and excited electronic states of H2+

This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.76.043412.We present an ab initio three-dimensional (3D) calculation of multiphoton ionization (MPI) and high-order harmonic generation (HHG) of the hydrogen molecular ions subject to intense linearly polarized laser pulses. The orientation of the molecular axis with respect to the polarization of the laser field can be arbitrary. The numerical procedure involves the extension of the generalized pseudospectral (GPS) method for nonuniform spatial discretization of the Hamiltonian and wave functions and time propagation using the split-operator technique in the energy representation. The calculations were performed for the ground and two first excited electronic states of H2+ at the internuclear separation R=2.0a.u. The laser pulse has a sine-squared envelope and contains 20 optical cycles with the wavelength 800nm. The dependence of MPI and HHG on the orientation angle is analyzed. We show that orientation effects are strongly affected by the symmetry of the wave function and the corresponding distribution of the electron density. While the anisotropy of MPI and HHG is rather weak for the 1σg state, both processes are suppressed at the orientation angle 90° for the 1σu state and at the angle 0° for the 1πu state. We discuss the multiphoton resonance and two-center interference effects in the HHG spectra which can lead both to enhancement and suppression of the harmonic generation

Generalized Floquet formulation of time-dependent current-density-functional theory

This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.58.4749.We present a generalized Floquet formulation of time-dependent current-density-functional theory for nonperturbative treatment of multiphoton processes of many-electron systems in intense monochromatic electric and magnetic fields. It is shown that the time-dependent Kohn-Sham-like equation can be transformed into an equivalent time-independent Floquet Hamiltonian matrix eigenvalue problem. A procedure is outlined for the determination of the dynamical properties in bound-bound multiphoton transitions. For the case of bound-free transitions, such as the multiphoton ionization processes, we introduce the notion of complex density and complex current and present a non-Hermitian Floquet formalism for the calculation of the complex quasienergies of individual spin orbitals and total many-electron systems

Ab initio study of high-order harmonic generation of H2 + in intense laser fields: Time-dependent non-Hermitian Floquet approach

This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.71.013408.We present a time-dependent non-Hermitian Floquet approach for the precision three-dimensional nonperturbative calculations of high-order harmonic generation (HHG) rates of the hydrogen molecular ions subject to intense laser fields. The procedure involves an extension of the complex-scaling generalized pseudospectral method for nonuniform spatial discretization of the Hamiltonian and non-Hermitian time propagation of the time-evolution operator. The approach is designed for effective and high-precision nonperturbative treatment of high-order multiphoton processes in very intense and/or low-frequency laser fields, which are generally more difficult to treat using the conventional time-independent non-Hermitian Floquet matrix techniques. The method is applied to the multiphoton ionization (MPI) and HHG calculations of H2+ for the wavelength 532nm at the equilibrium internuclear separation (R=2.0a.u.) and several laser intensities, as well as at the laser intensity 5×1013W/cm2 and various internuclear distances in the range between 3.0 and 17.5a.u. We found that both the MPI and HHG rates are strongly dependent on R. Further, at some internuclear separations R, the HHG productions are strongly enhanced and this phenomenon can be attributed to the resonantly enhanced MPI at these R. Finally, the enhancement of higher harmonics is found to take place mainly at larger R. Detailed study of the correlation between the behavior of MPI and HHG phenomena is presented