scholarly journals Observation of the ponderomotive effect in non-valence bound states of polyatomic molecular anions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Do Hyung Kang ◽  
Jinwoo Kim ◽  
Heung-Ryoul Noh ◽  
Sang Kyu Kim
Keyword(s):  
Bound States ◽  
Stark Effect ◽  
Ponderomotive Force ◽  
Bound State ◽  
Great Promise ◽  
Molecular Systems ◽  
Clear Cut ◽  
Molecular Anions ◽  
Dynamic Stark Effect ◽  
First Time

AbstractThe ponderomotive force on molecular systems has rarely been observed hitherto, despite potentially being extremely useful for the manipulation of the molecular properties. Here, the ponderomotive effect in the non-valence bound states has been experimentally demonstrated, for the first time to the best of our knowledge, giving great promise for the manipulation of polyatomic molecules by the dynamic Stark effect. Entire quantum levels of the dipole-bound state (DBS) and quadrupole-bound state (QBS) of the phenoxide (or 4-bromophenoxide) and 4-cyanophenoxide anions, respectively, show clear-cut ponderomotive blue-shifts in the presence of the spatiotemporally overlapped non-resonant picosecond control laser pulse. The quasi-free electron in the QBS is found to be more vulnerable to the external oscillating electromagnetic field compared to that in the DBS, suggesting that the non-valence orbital of the former is more diffusive and thus more polarizable compared to that of the latter.

scholarly journals Observation of the Ponderomotive Effect in Non-Valence Bound States of Polyatomic Molecular Anions

2021 ◽  
Author(s):  
Do Hyung Kang ◽  
Jinwoo Kim ◽  
Heung-Ryoul Noh ◽  
Sang Kyu kim
Keyword(s):  
Bound States ◽  
Stark Effect ◽  
Bound State ◽  
Polyatomic Molecules ◽  
Great Promise ◽  
Clear Cut ◽  
Molecular Anions ◽  
Dynamic Stark Effect ◽  
First Time ◽  
Control Laser

Abstract The ponderomotive effect in the non-valence bound states has been experimentally demonstrated for the first time, giving the great promise for the manipulation of the polyatomic molecules by the dynamic Stark effect. Entire quantum levels of the dipole-bound state (DBS) and quadruple-bound state (QBS) of the phenoxide (or 4-bromophenoxide) and 4-cyanophenoxide anions, respectively, show the clear-cut ponderomotive blue-shifts in the presence of the spatiotemporally overlapped non-resonant picosecond control laser pulse. The quasi-free electron in the QBS is found to be more vulnerable to the external oscillating electromagnetic field compared to that in the DBS, suggesting that the non-valence orbital of the former is more diffusive and thus more polarizable compared to that of the latter.

scholarly journals Observation of the Ponderomotive Effect in Non-Valence Bound States of Polyatomic Molecular Anions

2021 ◽  
Author(s):  
Do Hyung Kang ◽  
Jinwoo Kim ◽  
Heung-Ryoul Noh ◽  
Sang Kyu Kim
Keyword(s):  
Bound States ◽  
Stark Effect ◽  
Bound State ◽  
Polyatomic Molecules ◽  
Great Promise ◽  
Clear Cut ◽  
Molecular Anions ◽  
Dynamic Stark Effect ◽  
First Time ◽  
Control Laser

The ponderomotive effect in the non-valence bound states has been experimentally demonstrated for the first time, giving the great promise for the manipulation of the polyatomic molecules by the dynamic Stark effect. Entire quantum levels of the dipole-bound state (DBS) and quadruple-bound state (QBS) of the phenoxide (or 4-bromophenoxide) and 4-cyanophenoxide anions, respectively, show the clear-cut ponderomotive blue-shifts in the presence of the spatiotemporally overlapped non-resonant picosecond control laser pulse. The quasi-free electron in the QBS is found to be more vulnerable to the external oscillating electromagnetic field compared to that in the DBS, suggesting that the non-valence orbital of the former is more diffusive and thus more polarizable compared to that of the latter.

scholarly journals Studies on bound-state spectra of Manning–Rosen potential

2014 ◽  
Vol 29 (09) ◽  
pp. 1450042 ◽  
Author(s):  
Amlan K. Roy
Keyword(s):  
Bound States ◽  
Bound State ◽  
Wide Range ◽  
New States ◽  
Efficient Scheme ◽  
Molecular Potentials ◽  
Vibrational Energies ◽  
Rosen Potential ◽  
First Time ◽  
Potential Parameters

Accurate ro-vibrational energies, eigenfunctions, radial densities, expectation values are presented for the exponential-type Manning–Rosen (MR) potential. Bound states, accurate up to ten significant figure are obtained by employing a simple, reliable generalized pseudospectral (GPS) method. All 55 eigenstates with n ≤10 are treated for arbitrary values of potential parameters, covering a wide range of interaction, through a non-uniform, optimal spatial radial discretization. A detailed investigation has been made on energy changes with respect to screening and other potential parameters. A systematic estimation of critical screening parameters is given for these eigenstates. Special emphasis has been given to higher states and in the vicinity of critical screening region. A thorough comparison with literature results is made wherever possible. This surpasses the accuracy of all other existing methods currently available. Several new states are reported for the first time. In short, a simple, efficient scheme for accurate calculation of this and other molecular potentials is offered.

scholarly journals Structure and nucleotide-induced conformational dynamics of the Chlorobium tepidum Roco protein

2019 ◽  
Vol 476 (1) ◽  
pp. 51-66 ◽  
Author(s):  
Egon Deyaert ◽  
Margaux Leemans ◽  
Ranjan Kumar Singh ◽  
Rodrigo Gallardo ◽  
Jan Steyaert ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Bound States ◽  
Conformational Dynamics ◽  
Bound State ◽  
Chlorobium Tepidum ◽  
Leucine Rich Repeat ◽  
Hydrogen Deuterium ◽  
Gtpase Cycle ◽  
Hdx Ms ◽  
First Time

Abstract The LRR (leucine-rich repeat)–Roc (Ras of complex proteins)–COR (C-terminal of Roc) domains are central to the action of nearly all Roco proteins, including the Parkinson's disease-associated protein LRRK2 (leucine-rich repeat kinase 2). We previously demonstrated that the Roco protein from Chlorobium tepidum (CtRoco) undergoes a dimer–monomer cycle during the GTPase reaction, with the protein being mainly dimeric in the nucleotide-free and GDP (guanosine-5′-diphosphate)-bound states and monomeric in the GTP (guanosine-5′-triphosphate)-bound state. Here, we report a crystal structure of CtRoco in the nucleotide-free state showing for the first time the arrangement of the LRR–Roc–COR. This structure reveals a compact dimeric arrangement and shows an unanticipated intimate interaction between the Roc GTPase domains in the dimer interface, involving residues from the P-loop, the switch II loop, the G4 region and a loop which we named the ‘Roc dimerization loop’. Hydrogen–deuterium exchange coupled to mass spectrometry (HDX-MS) is subsequently used to highlight structural alterations induced by individual steps along the GTPase cycle. The structure and HDX-MS data propose a pathway linking nucleotide binding to monomerization and relaying the conformational changes via the Roc switch II to the LRR and COR domains. Together, this work provides important new insights in the regulation of the Roco proteins.

scholarly journals An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Yudai Ichikawa ◽  
Junko Yamagata-Sekihara ◽  
Jung Keun Ahn ◽  
Yuya Akazawa ◽  
Kanae Aoki ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Binding Energy ◽  
Decay Channel ◽  
Peak Shift ◽  
Bound State ◽  
Elastic Peak ◽  
Missing Mass ◽  
Decay Modes ◽  
Kaon Momentum ◽  
First Time

Abstract We have measured, for the first time, the inclusive missing-mass spectrum of the $^{12}$C$(K^-, p)$ reaction at an incident kaon momentum of 1.8 GeV/$c$ at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak ($K^-p \rightarrow K^-p$) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green’s function method by assuming different values of the parameters for the $\bar{K}$–nucleus optical potential. We found that the spectrum shape in the binding-energy region $-300 \, \text{MeV} < B_{K} < 40$ MeV is best reproduced with the potential depths $V_0 = -80$ MeV (real part) and $W_0 = -40$ MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around $B_{K} \sim 100$ MeV, where the major decay channel of $K^- NN \to \pi\Sigma N$ is energetically closed, and the non-mesonic decay modes ($K^- NN \to \Lambda N$ and $\Sigma N$) should mainly contribute. The enhancement is fitted well by a Breit–Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a $Y^{*}$-nucleus system.

scholarly journals Control of photodissociation with the dynamic Stark effect induced by THz pulses

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
A. Tóth ◽  
A. Csehi ◽  
G. J. Halász ◽  
Á. Vibók
Keyword(s):  
Stark Effect ◽  
Dynamic Stark Effect

scholarly journals Bound states of a Klein–Gordon particle in the presence of a smooth potential well

2020 ◽  
Vol 35 (23) ◽  
pp. 2050140
Author(s):  
Eduardo López ◽  
Clara Rojas
Keyword(s):  
Bound States ◽  
Gordon Equation ◽  
Bound State ◽  
Potential Well ◽  
One Dimensional ◽  
Smooth Potential ◽  
Klein Gordon ◽  
The One ◽  
Potential Parameters ◽  
Klein Gordon Equation

We solve the one-dimensional time-independent Klein–Gordon equation in the presence of a smooth potential well. The bound state solutions are given in terms of the Whittaker [Formula: see text] function, and the antiparticle bound state is discussed in terms of potential parameters.

Mill as Sage: The Essay on Bentham

PMLA ◽  
1974 ◽  
Vol 89 (1) ◽  
pp. 142-153 ◽  
Author(s):  
Eugene R. August
Keyword(s):  
John Stuart Mill ◽  
Great Promise ◽  
Rational Argument ◽  
Clear Cut

Although regarded as a philosopher rather than an artist, John Stuart Mill employs artistry as well as rational argument to enlighten his reader. Mill's “Bentham,” for example, demonstrates how Mill operates as a sage using both logic and art to awaken the reader to a new perception of reality. In “Bentham” Mill creates a sense of disappointment arising from Bentham's great promise and limited performance, both as thinker and as man. Constructing an image of himself as a whole thinker, Mill thereby underscores Bentham's position as half-thinker. Mill also creates an elaborate portrait of Bentham as a great father-teacher-hero-God figure, only to reveal Bentham's inability to perform these roles adequately. By heavy use of negatives, Mill suggests that Bentham's thought has little positive value. And, finally, the essay's structure undermines all of Bentham's philosophical contributions. Deriving from Carlyle's “Boswell's Life of Johnson,” Mill's earlier writings on Bentham show him refashioning Carlyle's language and developing the ironic techniques used in “Bentham.” Like other Victorian sages, Mill has no clear-cut theory of prose artistry; he often regards poetry and prose as antithetical media. Nevertheless, in practice he writes as a complex logician-artist, using prose as an imaginative medium.

RETARDATION EFFECTS IN COVARIANT THREE-DIMENSIONAL BOUND STATE WAVE FUNCTIONS

2005 ◽  
Vol 14 (06) ◽  
pp. 931-947 ◽  
Author(s):  
F. PILOTTO ◽  
M. DILLIG
Keyword(s):  
Bound States ◽  
Three Dimensional ◽  
Bound State ◽  
Relative Energy ◽  
Wave Functions ◽  
Three Dimensions ◽  
State Wave ◽  
Scalar Diquark ◽  
Bound State Wave Function ◽  
Retardation Effects

We investigate the influence of retardation effects on covariant 3-dimensional wave functions for bound hadrons. Within a quark-(scalar) diquark representation of a baryon, the four-dimensional Bethe–Salpeter equation is solved for a 1-rank separable kernel which simulates Coulombic attraction and confinement. We project the manifestly covariant bound state wave function into three dimensions upon integrating out the non-static energy dependence and compare it with solutions of three-dimensional quasi-potential equations obtained from different kinematical projections on the relative energy variable. We find that for long-range interactions, as characteristic in QCD, retardation effects in bound states are of crucial importance.

Sign in / Sign up

Export Citation Format

Share Document