A5101502159- Spectroscopy and Laser Applications
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Atmospheric Ozone and Climate
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Molecular spectroscopy and chirality
- Particle physics theoretical and experimental studies
- Spectroscopy and Quantum Chemical Studies
- Lanthanide and Transition Metal Complexes
- Inorganic Fluorides and Related Compounds
- Laser Design and Applications
- Dark Matter and Cosmic Phenomena
- Laser-Matter Interactions and Applications
- Photochemistry and Electron Transfer Studies
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Quantum Chromodynamics and Particle Interactions
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Atmospheric and Environmental Gas Dynamics
Vrije Universiteit Amsterdam
2012-2018
Anhui Normal University
2009-2010
The fundamental ground tone vibration of H2, HD, and D2 is determined to an accuracy 2 x 10^-4 cm^-1 from Doppler-free laser spectroscopy in the collisionless environment a molecular beam. This rotationless vibrational splitting derived combination difference between electronic excitation X^1Sg+, v=0 v=1 levels common EF^1g+, level. Agreement within $1\sigma$ experimental result full ab initio calculation provides stringent test quantum electrodynamics chemically-bound system.
The ionization energy of ortho-H_{2} has been determined to be E_{I}^{o}(H_{2})/(hc)=124 357.238 062(25) cm^{-1} from measurements the GK(1,1)-X(0,1) interval by Doppler-free, two-photon spectroscopy using a narrow band 179-nm laser source and GK(1,1) state continuous-wave, near-infrared spectroscopy. E_{I}^{o}(H_{2}) was used derive dissociation H_{2}, D_{0}^{N=1}(H_{2}), at 35 999.582 894(25) with precision that is more than one order magnitude better all previous results. new result...
The $\textrm{A}^1\Pi-\textrm{X}^1\Sigma^+$ band system of carbon monoxide, which has been detected in six highly redshifted galaxies ($z=1.6-2.7$), is identified as a novel probe method to search for possible variations the proton-electron mass ratio ($\mu$) on cosmological time scales. Laboratory wavelengths spectral lines A-X ($v$,0) bands $v=0-9$ have determined at an accuracy $\Delta\lambda/\lambda=1.5 \times 10^{-7}$ through VUV Fourier-transform absorption spectroscopy, providing...
The two lowest-v′ (0,0) and (1,0) bands of the A1Π −X1Σ+ system 12C16O have been investigated by high-resolution spectroscopic methods. A vacuum ultraviolet Fourier-transform spectrometer, illuminated synchrotron radiation, was applied to record a jet-cooled spectrum room temperature static gas spectrum, resulting in absolute accuracies 0.01−0.02 cm−1. In addition two-photon Doppler-free laser spectroscopy has limited number rotational lines, an accuracy 0.002 data were used perform improved...
Carbon monoxide (CO) absorption in the sub-damped Lyα absorber at redshift toward background quasar SDSS J123714.60+064759.5 (J1237+0647) was investigated for first time order to search a possible variation of proton-to-electron mass ratio, μ, over cosmological timescale. The observations were performed with Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph signal-to-noise ratio 40 per 2.5 km s−1 pixel ∼5000 Å. Thirteen CO vibrational bands this are detected: − (, 0) , (0, 0),...
Precision measurements are performed on highly excited vibrational quantum states of molecular hydrogen. The v = 12, J 0 - 3 rovibrational levels H2 (X(1)Σg (+)), lying only 2000 cm(-1) below the first dissociation limit, were populated by photodissociation H2S and their level energies accurately determined two-photon Doppler-free spectroscopy. A comparison between experimental results 12 with best ab initio calculations shows a good agreement, where present accuracy 3.5 × 10(-3) is more...
Recently a high precision spectroscopic investigation of the $EF{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}_{g}^{+}$--$X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}_{g}^{+}$ system molecular hydrogen was reported yielding information on QED and relativistic effects in sequence rotational quantum states $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\ensuremath{\Sigma}}_{g}^{+}$ ground state H${}_{2}$ molecule [Salumbides et al., Phys. Rev. Lett. 107, 043005 (2011)]. The present...
Accurate $$EF^1\varSigma ^+_g{-}X^1\varSigma ^+_g$$ transition energies in molecular hydrogen were determined for transitions originating from levels with highly excited vibrational quantum number, v = 11, the ground electronic state. Doppler-free two-photon spectroscopy was applied on vibrationally $$\hbox {H}_2^*$$ , produced via photodissociation of H2S, yielding frequencies accuracies 45 MHz or 0.0015 cm−1. An important improvement is enhanced detection efficiency by resonant excitation...
High-precision two-photon Doppler-free frequency measurements have been performed on the CO A(1)Π - X(1)Σ(+) fourth-positive system (2,0), (3,0), and (4,0) bands. Absolute frequencies of forty-three transitions, for rotational quantum numbers up to J = 5, determined at an accuracy 1.6 × 10(-3) cm(-1), using advanced techniques two-color 2 + 1' resonance-enhanced multi-photon ionization, Sagnac interferometry, frequency-chirp analysis laser pulses, correction AC-Stark shifts. The accurate...
The (2,0) (3,0) and (4,0) bands of the A$^1\Pi-$X$^1\Sigma^+$ system $^{12}$C$^{16}$O have been re-investigated by high-resolution vacuum ultraviolet absorption spectroscopy. A VUV Fourier-transform spectrometer, illuminated synchrotron radiation, was applied to record a jet-cooled spectrum, room temperature static gas spectrum high (900 K) quasi-static resulting in absolute accuracies 0.01$-$0.02 cm$^{-1}$ for rotational line frequencies. Precise laser-based data were included analysis...
The reduced <italic>T</italic>(<italic>J</italic>) − <italic>B</italic><sub>A</sub><italic>J</italic>(<italic>J</italic> + 1) <italic>D</italic><sub>A</sub><italic>J</italic><sup>2</sup>(<italic>J</italic> 1)<sup>2</sup> term values for the <sup>12</sup>C<sup>17</sup>O A<sub>1</sub>Π (<italic>υ</italic> = 5) level and hypothetical unperturbed crossing rovibronic levels of perturbers.
The lowest v = 0 level of the A1Π state 13C16O isotopologue carbon monoxide has been reinvestigated with a variety high-resolution spectroscopic techniques. −X1Σ+(0, 0) band studied by vacuum-ultraviolet Fourier-transform absorption spectroscopy, using SOLEIL synchrotron as radiation source. Spectra were obtained under quasi-static gas conditions at liquid-nitrogen temperature, room temperature and an elevated 900 K, absolute accuracies 0.01−0.03 cm−1. Two-photon Doppler-free laser...
The first three-dimensional interaction potential energy surface of the Xe-CO complex is developed using single and double excitation coupled cluster theory with noniterative treatment triple excitations. Mixed basis sets, aug-cc-pVQZ for C O atoms aug-cc-pVQZ-PP Xe atom, including an additional (3s3p2d2f1g) set midbond functions are used. calculated point energies at five fixed r(co) values fitted to analytic two-dimensional model, further model potentials used construct by interpolating...
The A1Π(v = 0) level of 12C18O has been reinvestigated using three different high-resolution spectroscopic methods: (1) 2 + 1′ resonance-enhanced multiphoton ionisation the A1Π − X1Σ+(0, band narrowband lasers in a Doppler-free geometry; (2) Fourier-transform emission spectroscopy visible range probing B1Σ+ A1Π(0, discharge; (3) absorption vacuum-ultraviolet measuring and bands at multiple temperatures ranging from 90 to 900 K. An effective-Hamiltonian analysis A1Π, v 0 levels was performed...
The first three-dimensional interaction potential energy surface (PES) of the Ar2-Ne complex is developed using single and double excitation coupled cluster theory with noniterative treatment triple excitations CCSD(T). aug-cc-pVQZ basis sets are employed for all atoms, including an additional (3s3p2d2f1g) set midpoint bond functions. calculated point energies fitted to analytic two-dimensional model at each seven fixed rAr2 values. potentials then used construct PES by interpolating along...