Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

中国激光(英文版)

Multiphoton Ionization Spectra of Yb Atom in Electric Fields

FANG DA-WEI

Published Jan 1, 2000• 0 citations
OpenAlex

Abstract

This paper reports the investigation of the resonance spectra of different highly excited states of Yb atom in electric fields from near zero to 15000V/cm by means of multiphoton excitation. Most of observed resonance peaks are identified and the selection rules and the intensities of the transition are discussed. The evolutions of the lines in applied electric fields are observed and analyzed. The results shows that transitions involving the excitation of the 4f 14  subshell play an important role in the spectral behavior of highly excited states of Yb atom.

Related papers

A study of multiphoton ionization spectrum of Yb atom in electric fields

Fang Da

We report here the measurement of the resonance spectrum of different highly\|excited states of Yb atom by means of multiphoton excitation in the applied electric field from near zero to 15000V/cm.The investigated resonance peaks are identified and the selection rules and the intensities of the transition lines are discussed.The evolutions of the lines in applied electric fields are observed and analyzed.The results show directly that transitions involving the excitation of the 4f\+\{14\} subshell play an important role in the spectral behaviour of highly\|excited states of Yb atom.

Journal of China Institute of Metrology•Jan 1, 2000•0 citations

Understanding Inner-Shell Excitations in Molecules through Spectroscopy of the 4f Hole States of YbF

S. Popa, Sascha Schaller, André Fielicke +4 more

Molecules containing a lanthanide atom have sets of electronic states arising from excitation of an inner-shell electron. These states have received little attention but are thought to play an important role in laser cooling of such molecules and may be a useful resource for testing fundamental physics. We study a series of inner-shell excited states in YbF using resonance-enhanced multiphoton ionization spectroscopy. We investigate the excited states of lowest energy, 8474, 9013, and 9090 cm−1 above the ground state, all corresponding to the configuration 4f136s2 F27/2 of the Yb+ ion. They are metastable, since they have no electric dipole allowed transitions to the ground state. We also characterize a state at 31 050 cm−1 that is easily excited from both the ground and metastable states, which makes it especially useful for this spectroscopic study. Finally, we study two states at 48 720 and 48 729 cm−1 , which are above the ionization limit and feature strong autoionizing resonances that prove useful for efficient detection of the molecules and for identifying the rotational quantum number of each line in the spectrum. We resolve the rotational structures of all these states and find that they can all be described by a very simple model based on Hund’s case (c). Our study provides information necessary for laser slowing and magneto-optical trapping of YbF, which is an important species for testing fundamental physics. We also consider whether the low-lying inner-shell states may themselves be useful as probes of the electron’s electric dipole moment or of varying fundamental constants, since they are long-lived states in a laser-coolable molecule featuring closely spaced levels of opposite parity. Published by the American Physical Society 2024

arXiv:2402.10692•Physical Review X•May 30, 2024•5 citations

Photoionization spectroscopy of Yb I from the 6s7sS01 state in the presence of a static electric field

Christophe Blondel, René-Jean Champeau, Christian Delsart

Laser investigation of the photoionization spectra in the presence of an electric field has been performed in $\ensuremath{\pi}$ and $\ensuremath{\sigma}$ polarizations on an ytterbium atomic beam from the particular level $4{f}^{14}6s7s^{1}S_{0}$ which was populated by a two-step excitation. Broad modulations (in $\ensuremath{\pi}$ polarization) and Stark resonances in the vicinity of the zero-field ionization limit are interpreted satisfactorily as in the case of alkali atoms. However, the photoionization spectra are deeply affected by the presence of two perturbing levels belonging to the configuration $4{f}^{13}5{d}^{2}6s$. This phenomenon is explained by strong interference effects between the structured Stark continuum and the field-induced autoionizing states corresponding to the doubly excited levels.

Physical Review A•Jan 1, 1983•12 citations

Multiphoton ionization of Na and K in a modest electric field

Y. Teraoka, Yuuki Sato, J. Murakami

Multiphoton ionization (MPI) via two-photon resonance with high-lying Rydberg levels is observed on Na and K atoms in modest (12--120 V/cm) dc electric fields. The field-induced MPI signals are manifested to such an extent that the nominally forbidden MPI via two-photon resonance with the np levels is induced at the same signal levels as or more intensely than the allowed MPI via the ns and nd Rydberg levels. The intensity inversion between the allowed and the forbidden MPI signals is observed on the K atoms in the wavelength region where the two-photon energy is very close to the field-ionization limit.

Physical Review A•Dec 1, 1985•14 citations

Microwave multiphoton ionization and excitation of helium Rydberg atoms

Willem van de Water, Suzanne Yoakum, Ton van Leeuwen +5 more

We study experimentally and theoretically the detailed field-amplitude dependence of the multiphoton ionization and excitation probability of highly excited ${\mathit{n}}_{0}$ $^{3}$S helium atoms in a 9.924-GHz linearly polarized microwave electric field. For ionization, with principal quantum numbers in the range ${\mathit{n}}_{0}$=25--32, we use a quasistatic analysis that employs integration of the time-dependent Schr\"odinger equation using basis states of the static field Hamiltonian. The calculated results are used to interpret the observed ionization threshold structure. For excitation, the results of ${\mathit{n}}_{0}$ $^{3}$S\ensuremath{\rightarrow}${\mathit{n}}_{0}$ $^{3}$L, L>2 excitation experiments are explained quantitatively and precisely using a theory of multiphoton resonances. We present maps of quasienergy levels that allow the study of the dynamics of the field-switching transients. These transient effects are analyzed along the lines of standard atomic collision theory and are shown to determine the shape of the observed resonances.

Physical Review A•Jul 1, 1990•40 citations

Multiphoton ionization of atoms

Nikolai B. Delone

The most important results of study of multiphoton ionization of atoms are reviewed. Discussions are presented of specific features of the process, theoretical methods of description of ionization of atoms in a strong light field, the basic principles of design of experiments in which intense laser radiation is used, results of investigation of direct and resonance processes of multiphoton ionization, and the mutual relation between multiphoton processes (multiphoton excitation and ionization) and various phenomena leading to perturbation of the spectrum of bound states of an electron in an atom under the influence of a strong light field.

Soviet Physics Uspekhi•Mar 31, 1975•57 citations
This paper reports the investigation of the resonance spectra of different highly excited states of Yb atom in electric fields from near zero to 15000V/cm by means of multiphoton excitation. Most of observed resonance peaks are identified and the selection rules and the intensities of the transition are discussed. The evolutions of the lines in applied electric fields are observed and analyzed. The results shows that transitions involving the excitation of the 4f 14  subshell play an important role in the spectral behavior of highly excited states of Yb atom.
We report here the measurement of the resonance spectrum of different highly\|excited states of Yb atom by means of multiphoton excitation in the applied electric field from near zero to 15000V/cm.The investigated resonance peaks are identified and the selection rules and the intensities of the transition lines are discussed.The evolutions of the lines in applied electric fields are observed and analyzed.The results show directly that transitions involving the excitation of the 4f\+\{14\} subshell play an important role in the spectral behaviour of highly\|excited states of Yb atom.
Molecules containing a lanthanide atom have sets of electronic states arising from excitation of an inner-shell electron. These states have received little attention but are thought to play an important role in laser cooling of such molecules and may be a useful resource for testing fundamental physics. We study a series of inner-shell excited states in YbF using resonance-enhanced multiphoton ionization spectroscopy. We investigate the excited states of lowest energy, 8474, 9013, and 9090 cm−1 above the ground state, all corresponding to the configuration 4f136s2 F27/2 of the Yb+ ion. They are metastable, since they have no electric dipole allowed transitions to the ground state. We also characterize a state at 31 050 cm−1 that is easily excited from both the ground and metastable states, which makes it especially useful for this spectroscopic study. Finally, we study two states at 48 720 and 48 729 cm−1 , which are above the ionization limit and feature strong autoionizing resonances that prove useful for efficient detection of the molecules and for identifying the rotational quantum number of each line in the spectrum. We resolve the rotational structures of all these states and find that they can all be described by a very simple model based on Hund’s case (c). Our study provides information necessary for laser slowing and magneto-optical trapping of YbF, which is an important species for testing fundamental physics. We also consider whether the low-lying inner-shell states may themselves be useful as probes of the electron’s electric dipole moment or of varying fundamental constants, since they are long-lived states in a laser-coolable molecule featuring closely spaced levels of opposite parity. Published by the American Physical Society 2024
Laser investigation of the photoionization spectra in the presence of an electric field has been performed in $\ensuremath{\pi}$ and $\ensuremath{\sigma}$ polarizations on an ytterbium atomic beam from the particular level 4f146s7s1S04{f}^{14}6s7s^{1}S_{0}4f146s7s1S0​ which was populated by a two-step excitation. Broad modulations (in $\ensuremath{\pi}$ polarization) and Stark resonances in the vicinity of the zero-field ionization limit are interpreted satisfactorily as in the case of alkali atoms. However, the photoionization spectra are deeply affected by the presence of two perturbing levels belonging to the configuration 4f135d26s4{f}^{13}5{d}^{2}6s4f135d26s. This phenomenon is explained by strong interference effects between the structured Stark continuum and the field-induced autoionizing states corresponding to the doubly excited levels.
Multiphoton ionization (MPI) via two-photon resonance with high-lying Rydberg levels is observed on Na and K atoms in modest (12--120 V/cm) dc electric fields. The field-induced MPI signals are manifested to such an extent that the nominally forbidden MPI via two-photon resonance with the np levels is induced at the same signal levels as or more intensely than the allowed MPI via the ns and nd Rydberg levels. The intensity inversion between the allowed and the forbidden MPI signals is observed on the K atoms in the wavelength region where the two-photon energy is very close to the field-ionization limit.
We study experimentally and theoretically the detailed field-amplitude dependence of the multiphoton ionization and excitation probability of highly excited n0{\mathit{n}}_{0}n0​ 3^{3}3S helium atoms in a 9.924-GHz linearly polarized microwave electric field. For ionization, with principal quantum numbers in the range n0{\mathit{n}}_{0}n0​=25--32, we use a quasistatic analysis that employs integration of the time-dependent Schr\"odinger equation using basis states of the static field Hamiltonian. The calculated results are used to interpret the observed ionization threshold structure. For excitation, the results of n0{\mathit{n}}_{0}n0​ 3^{3}3S\ensuremath{\rightarrow}n0{\mathit{n}}_{0}n0​ 3^{3}3L, L>2 excitation experiments are explained quantitatively and precisely using a theory of multiphoton resonances. We present maps of quasienergy levels that allow the study of the dynamics of the field-switching transients. These transient effects are analyzed along the lines of standard atomic collision theory and are shown to determine the shape of the observed resonances.
The most important results of study of multiphoton ionization of atoms are reviewed. Discussions are presented of specific features of the process, theoretical methods of description of ionization of atoms in a strong light field, the basic principles of design of experiments in which intense laser radiation is used, results of investigation of direct and resonance processes of multiphoton ionization, and the mutual relation between multiphoton processes (multiphoton excitation and ionization) and various phenomena leading to perturbation of the spectrum of bound states of an electron in an atom under the influence of a strong light field.