Publications (2020)
Publications sorted by date descending
Electron impact ionization of R-carvone: I. Mass spectra and appearance energies
Authors: Lopes, M. C. A.; Pires, W. A. D.; Amorim, R. A. A.; Fernandes, A. C. P.; Casagrande, T. M.; Jones, D. B.; Blanco, F.; Garcia, G.; Brunger, M. J.
Contribution: Article
Journal: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
Publication date: 2020/10/01
DOI: 10.1016/j.ijms.2020.116395
Abstract: The mass spectrum of R-carvone measured at 70 eV electron impact energy, in the mass region of 1-151 amu, is reported in this work. We observed in this spectrum 103 peaks associated with ionic fragmentation, 55 of them with abundances greater than 1%. The relative abundances, from […]
Intrinsic folding of the cysteine residue: competition between folded and extended forms mediated by the -SH group
Authors: Goldsztejn, Gildas; Mundlapati, Venkateswara Rao; Brenner, Valerie; Gloaguen, Eric; Mons, Michel; Cabezas, Carlos; Leon, Iker; Luis Alonso, Jose
Contribution: Article
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2020/09/28
DOI: 10.1039/d0cp03136d
Abstract: A dual microwave and optical spectroscopic study of a capped cysteine amino acid isolated in a supersonic expansion, combined with quantum chemistry modelling, enabled us to characterize the conformational preferences of Cys embedded in a protein chain. IR/UV double resonance spectroscopy provided evidence for the coexistence of two conformers, assigned to folded and extended backbones (with classical C7 and […]
Gas-phase kinetics of CH3CHO with OH radicals between 11.7 and 177.5 K
Authors: Blazquez, Sergio; Gonzalez, Daniel; Neeman, Elias M.; Ballesteros, Bernabe; Agundez, Marcelino; Canosa, Andre; Albaladejo, Jose; Cernicharo, Jose; Jimenez, Elena
Contribution: Article
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2020/09/28
DOI: 10.1039/d0cp03203d
Abstract: Gas-phase reactions in the interstellar medium (ISM) are a source of molecules in this environment. The knowledge of the rate coefficient for neutral-neutral reactions as a function of temperature,k(T), is essential to improve astrochemical models. In this work, we have experimentally measuredk(T) for the reaction between the OH radical and acetaldehyde, both present in many sources of the […]
Interstellar nitrile anions: Detection of C3N- and C5N- in TMC-1
Authors: Cernicharo, J.; Marcelino, N.; Pardo, J. R.; Agundez, M.; Tercero, B.; de Vicente, P.; Cabezas, C.; Bermudez, C.
Contribution: Article
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2020/09/23
DOI: 10.1051/0004-6361/202039231
Abstract: We report on the first detection of C3N and C5N towards the cold dark core TMC-1 in the Taurus region, using the Yebes 40m telescope. The observed C3N /C3N and C5N /C5N abundance ratios are similar to 140 and similar to 2, respectively; that is similar to those found in the circumstellar envelope of the carbon-rich star IRC +10216. Although […]
The abundance of S- and Si-bearing molecules in O-rich circumstellar envelopes of AGB stars
Authors: Massalkhi, S.; Agundez, M.; Cernicharo, J.; Velilla-Prieto, L.
Contribution: Article
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2020/09/09
DOI: 10.1051/0004-6361/202037900
Abstract: Aims. We aim to determine the abundances of SiO, CS, SiS, SO, and SO2 in a large sample of oxygen-rich asymptotic giant branch (AGB) envelopes covering a wide range of mass loss rates to investigate the potential role that these molecules could play in the formation of dust in these environments.Methods. We surveyed a sample of 30 oxygen-rich AGB stars in the lambda 2 mm band using the IRAM 30m […]
Entangling Superconducting Qubits through an Analogue Wormhole
Authors: Sabin, Carlos
Contribution: Article
Journal: UNIVERSE
Publication date: 2020/09/09
Abstract: We propose an experimental setup to test the effect of curved spacetime upon the extraction of entanglement from the quantum field vacuum to a pair of two-level systems. We consider two superconducting qubits coupled to a dc-SQUID array embedded into an open microwave transmission line, where an external bias can emulate a spacetime containing a traversable wormhole. We find that the amount of vacuum entanglement that can be extracted by the qubits depends on the wormhole parameters. At […]
Lorentzian Symmetric Spaces Which are Einstein-Yang-Mills with Respect to Invariant Metric Connections
Authors: Castrillon Lopez, Marco; Gadea, P. M.; Rosado Maria, Maria Eugenia
Contribution: Article
Journal: RESULTS IN MATHEMATICS
Publication date: 2020/09/05
DOI: 10.1007/s00025-020-01259-4
Abstract: We classify four-dimensional connected simply-connected Lorentzian symmetric spaces M with connected nontrivial isotropy group furnishing solutions of the Einstein-Yang-Mills equations. Those solutions are built with respect to some invariant metric connection. in the bundle of orthonormal frames of M and some diagonal metric on the holonomy algebra corresponding to Lambda.
Single-atom heat engine as a sensitive thermal probe
Authors: Levy, Amikam; Goeb, Moritz; Deng, Bo; Singer, Kilian; Torrontegui, E.; Wang, Daqing
Contribution: Article
Journal: NEW JOURNAL OF PHYSICS
Publication date: 2020/09/01
Abstract: We propose employing a quantum heat engine as a sensitive probe for thermal baths. In particular, we study a single-atom Otto engine operating in an open thermodynamic cycle. Owing to its cyclic nature, the engine is capable of translating small temperature differences between two baths into a macroscopic oscillation in a flywheel. We present analytical and numerical modeling of the quantum dynamics of the engine […]
A Complete Cross Section Data Set for Electron Scattering by Pyridine: Modelling Electron Transport in the Energy Range 0-100 eV
Authors: Costa, Filipe; Traore-Dubuis, Ali; Alvarez, Lidia; Lozano, Ana, I; Ren, Xueguang; Dorn, Alexander; Limao-Vieira, Paulo; Blanco, Francisco; Oller, Juan C.; Munoz, Antonio; Garcia-Abenza, Adrian; Gorfinkiel, Jimena D.; Barbosa, Alessandra S.; Bettega, Marcio H. F.; Stokes, Peter; White, Ronald D.; Jones, Darryl B.; Brunger, Michael J.; Garcia, Gustavo
Contribution: Article
Journal: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Publication date: 2020/09/01
DOI: 10.3390/ijms21186947
Abstract: Electron scattering cross sections for pyridine in the energy range 0-100 eV, which we previously measured or calculated, have been critically compiled and complemented here with new measurements of […]
DEATHSTAR: Nearby AGB stars with the Atacama Compact Array I. CO envelope sizes and asymmetries: A new hope for accurate mass-loss-rate estimates
Authors: Ramstedt, S.; Vlemmings, W. H. T.; Doan, L.; Danilovich, T.; Lindqvist, M.; Saberi, M.; Olofsson, H.; De Beck, E.; Groenewegen, M. A. T.; Hofner, S.; Kastner, J. H.; Kerschbaum, F.; Khouri, T.; Maercker, M.; Montez, R.; Quintana-Lacaci, G.; Sahai, R.; Tafoya, D.; Zijlstra, A.
Contribution: Article
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2020/08/28
DOI: 10.1051/0004-6361/201936874
Abstract: Context. This is the first publication from the DEATHSTAR project. The overall goal of the project is to reduce the uncertainties of the observational estimates of mass-loss rates from evolved stars on the Asymptotic […]
Statistical physics of flux-carrying Brownian particles
Authors: Valido, Antonio A.
Contribution: Article
Journal: ANNALS OF PHYSICS
Publication date: 2020/08/26
DOI: 10.1016/j.aop.2020.168300
Abstract: Chern-Simons gauge field theory has provided a natural frame-work to gain deep insight about many novel phenomena in two-dimensional condensed matter. We investigate the nonequilibrium thermodynamics properties of a (two-dimensional) dissipative harmonic particle when the Abelian topological gauge action and the (linear) Brownian motion dynamics are treated on an equal footing. We find out that the particle exhibits remarkable magneticlike features in the quantum domain that are beyond the celebrated Landau diamagnetism: this could be […]
Dynamics of Rydberg excitations and quantum correlations in an atomic array coupled to a photonic crystal waveguide
Authors: Chougale, Yashwant; Talukdar, Jugal; Ramos, Tomas; Nath, Rejish
Contribution: Article
Journal: PHYSICAL REVIEW A
Publication date: 2020/08/25
DOI: 10.1103/PhysRevA.102.022816
Abstract: We study the dynamics of up to two Rydberg excitations and the correlation growth in a chain of atoms coupled to a photonic crystal waveguide. In this setup, an excitation can hop from one atom to another via exponentially decaying exchange interactions mediated by the waveguide. An initially localized excitation undergoes a continuous-time quantum walk for short-range hopping, and for long-range hopping, it experiences quasilocalization. In addition, the inverse participation […]
Dissipative quantum backflow (vol 135, 324, 2020)
Authors: Mousavi, S. V.; Miret-Artes, S.
Contribution: Correction
Journal: EUROPEAN PHYSICAL JOURNAL PLUS
Publication date: 2020/08/14
DOI: 10.1140/epjp/s13360-020-00655-7
Abstract:
Non-adiabatic quantum dynamics of the electronic quenching OH(A(2)sigma(+)) + Kr
Authors: Gamallo, Pablo; Zanchet, Alexandre; Aoiz, F. Javier; Petrongolo, Carlo
Contribution: Article
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2020/08/14
DOI: 10.1039/d0cp02512g
Abstract: We present the dynamics of the electronic quenching OH(A(2)sigma(+)) + Kr(S-1) -> OH(X-2 pi) + Kr(S-1), with OH(A(2)sigma(+)) in the ground ro-vibrational state. This study relies on a new non-adiabatic quantum theory that uses three diabatic electronic states sigma(+), pi ‘, and pi ”, coupled by one conical-intersection and nine Renner-Teller matrix elements, all of which are explicitly considered in the equation of the motion. The time-dependent mechanism […]
Possible Formation and Destruction of the OD+ Ions in the Interstellar Medium
Authors: Bulut, Niyazi; Roncero, Octavio; Lique, Francois
Contribution: Article
Journal: JOURNAL OF PHYSICAL CHEMISTRY A
Publication date: 2020/08/13
Abstract: The OH+ ion is an important constituent of the interstellar medium (ISM). It can be used as a probe of cosmic ray and X-ray ionization rates in molecular clouds as well as a tracer of oxygen chemistry. The deuterated variant of OH+, the OD+ ion, may also be present in the ISM despite the fact that it has not been detected yet. In this paper, we aim at providing quantitative […]