Ionization energy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Li</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>6</mml:mn><mml:mo>,</mml:mo><mml:mn>7</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>determined by triple-resonance laser spectroscopy

Bushaw, Bruce A.; Nörtershäuser, W.; Drake, G. W. F.; Kluge, H.-J.

doi:10.1103/physreva.75.052503

Cited by 57 publications

(38 citation statements)

References 43 publications

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“…There is no essential difference between the QP theories using the neutral ground state and Refs. [36,37,46,47]. Arrows represent electrons (spin) occupying the level.…”

Section: Test Calculationsmentioning

confidence: 99%

“…All the other reference values a−g are experimental data [36][37][38][39][40][41]. b References [36,37].…”

Section: Test Calculationsmentioning

confidence: 99%

“…EC in Table I means the value calculated by the EOM coupled cluster singles and doubles (EOM-CCSD) with aug-cc-pV5Z basis set using Gaussian 09 [35]. References [36][37][38][39][40][41][42][43][44][45] are all experimental data. We find good agreements between the EQP energies of the forward (→) electron absorption process and the backward (←) electron release process.…”

Section: Test Calculationsmentioning

confidence: 99%

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A simple derivation of the exact quasiparticle theory and its extension to arbitrary initial excited eigenstates

Ohno

Ono

Isobe

2017

The Journal of Chemical Physics

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The quasiparticle (QP) energies, which are minus of the energies required by removing or produced by adding one electron from/to the system, corresponding to the photoemission or inverse photoemission (PE/IPE) spectra, are determined together with the QP wave functions, which are not orthonormal and even not linearly independent but somewhat similar to the normal spin orbitals in the theory of the configuration interaction, by self-consistently solving the QP equation coupled with the equation for the self-energy. The electron density, kinetic and all interaction energies can be calculated using the QP wave functions. We prove in a simple way that the PE/IPE spectroscopy and therefore this QP theory can be applied to an arbitrary initial excited eigenstate. In this proof, we show that the energy-dependence of the self-energy is not an essential difficulty, and the QP picture holds exactly if there is no relaxation mechanism in the system. The validity of the present theory for some initial excited eigenstates is tested using the one-shot GW approximation for several atoms and molecules. * ohno@ynu.ac.jp

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“…There is no essential difference between the QP theories using the neutral ground state and Refs. [36,37,46,47]. Arrows represent electrons (spin) occupying the level.…”

Section: Test Calculationsmentioning

confidence: 99%

“…All the other reference values a−g are experimental data [36][37][38][39][40][41]. b References [36,37].…”

Section: Test Calculationsmentioning

confidence: 99%

Section: Test Calculationsmentioning

confidence: 99%

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A simple derivation of the exact quasiparticle theory and its extension to arbitrary initial excited eigenstates

Ohno

Ono

Isobe

2017

The Journal of Chemical Physics

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“…Therefore, Doppler-free techniques have been widely used in precision spectroscopy [4][5][6][7][8]. Particularly, zero-background Doppler-free scheme, such as polarization spectroscopy [16,17], intermodulated optogalvanic spectroscopy [18,19], intermodulated fluorescence spectroscopy [20], resonance ionization spectroscopy [21] and crossed laser-atomic beam methods [5-8, 11, 12] are powerful techniques to improve spectral SNR for observing weak transitions.…”

Section: Introductionmentioning

confidence: 99%

Doppler-free intermodulated fluorescence spectroscopy of 4He 23P–31,3D transitions at 588 nm with a 1-W compact laser system

Luo

Feng

et al. 2015

Appl. Phys. B

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Abstract:We have demonstrated Doppler-free intermodulated fluorescence spectroscopy of helium 2 3 P-3 1,3 D transitions in an rf discharged sealed-off cell using a compact laser system at 588 nm. An external cavity diode laser at 1176 nm was constructed to seed a Raman fiber amplifier. Laser power of more than one watt at 588 nm was produced by frequency doubling of the fiber amplifier output using a MgO:PPLN crystal. A doubling efficiency of 23 % was achieved. The power-dependent spectra of the 2

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“…Results of the research can be useful for fundamental physics and for some applications as quantum computers. Atoms can be optically transferred to definite Rydberg states by twophoton or multi-photon excitation processes [3,4]. The problem is to diagnose highly-excited states.…”

mentioning

confidence: 99%

Two-photon excitation of ultracold atoms to Rydberg states

Saakyan

Sautenkov

Vilshanskaya

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. In this work, we discuss two-photon excitation and diagnostic of ultracold Rydberg atoms in a magneto-optical trap. Lithium atoms were excited by using ultraviolet cw laser. For identification of Rydberg transitions, we recorded resonance fluorescence of ultracold atoms. Spectra of transitions 2P-nS, 2p-nD were measured. Our results are in good agreement with calculations and experimental data available in literature. Presented work is a part of our project focused on preparation and study of Rydberg matter and ultracold plasma.Our research project is focused on study of a Rydberg matter and non-ideal plasma [1,2]. Results of the research can be useful for fundamental physics and for some applications as quantum computers. Atoms can be optically transferred to definite Rydberg states by twophoton or multi-photon excitation processes [3,4]. The problem is to diagnose highly-excited states. In addition to the traditional approach, induced ionization of Rydberg atoms by applied electric field [2], recently EIT [5] and FWM [6] techniques have been used for identification of the Rydberg transitions. As the first step in our research project we have performed cw two-step excitation of ultracold lithium atoms from the ground state to a highly-excited state. In the current paper we describe our experimental setup and observation of the Rydberg transitions in lithium atoms in magneto-optical trap (MOT). A basic description of the MOT for lithium atoms is presented in [7]. Our vacuum system is similar to an experimental apparatus which used in laboratory of A. Turlapov for investigation of the Fermi gas of 6 Li atoms [8]. The atomic transitions, which participated in excitation of Rydberg states, are shown in figure 1.Optical transitions in D 2 line are used for optical cooling and trapping of lithium atoms. Optical transitions in D 1 line are used for absorption measurements of an atomic cloud in MOT by using a weak probe laser. In figure 1 a blue arrow shows an ultraviolet transition (350 nm) from the excited state 2P 3/2 to highly excited states.In our laboratory an experimental setup for trapping and ultraviolet excitation of 7 Li atoms is assembled. Our setup is described in [9][10][11]. It consists of vacuum and optical systems. The vacuum system includes an oven (the source of a thermal atomic beam), a Zeeman slower, and a main vacuum chamber (residual air pressure < 10 −9 mbar), where 7 Li atoms are trapped.In the optical part of the setup we use two amplified external cavity diode lasers (ECDL) for the cooling and trapping of 7 Li atoms. One of them is the cooling laser, which is slightly detuned from the cycling transition 2S 1/2 (F = 2)-2P 3/2 (F ′ = 3). This laser is locked to the thermally stabilized reference cavity with tunable transmission resonances. The other laser is repump laser ELBRUS 2015

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Ionization energy ofLi6,7determined by triple-resonance laser spectroscopy

Cited by 57 publications

References 43 publications

A simple derivation of the exact quasiparticle theory and its extension to arbitrary initial excited eigenstates

A simple derivation of the exact quasiparticle theory and its extension to arbitrary initial excited eigenstates

Doppler-free intermodulated fluorescence spectroscopy of 4He 23P–31,3D transitions at 588 nm with a 1-W compact laser system

Two-photon excitation of ultracold atoms to Rydberg states

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