Experimental setup for laser spectroscopy of molecules in a high magnetic field

Takazawa, Yasuyuki Kimura and Ken

doi:10.1063/1.3514982

Cited by 2 publications

(3 citation statements)

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“…Therefore, the type of the Landau level (ν) corresponds uniquely with the core state N + . In addition, the N = 0 level is selected by other following reasons: (i) Overlap of the pump X 2 1/2 -A 2 + rotational transitions is avoided most easily than pumping other N levels [37]. (ii) Population is largest among the N levels [37].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the N = 0 level is selected by other following reasons: (i) Overlap of the pump X 2 1/2 -A 2 + rotational transitions is avoided most easily than pumping other N levels [37]. (ii) Population is largest among the N levels [37]. (iii) Overlap of the M J sublevel is avoided as explained in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…A new experimental setup having a molecular beam source was built, and molecules under collision-free conditions were thus prepared [37]. In the present study, using this setup, NO molecules are excited to the positive-energy Landau levels by the double-resonance method in a magnetic field of 0-7 T. Measuring the rotational structures of the Landau levels is tried.…”

Section: Introductionmentioning

confidence: 99%

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Landau levels of molecules: Angular-momentum coupling between cyclotron motion and core rotation

Kimura

Takazawa

2014

Phys. Rev. A

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In a high magnetic field of 3-7 T, nitric oxide (NO) molecules are excited by the double-resonance method through the intermediate A 2 + F 1 (v = 0,N = 0) level to the Landau levels in the energy region above the zero-field ionization limit to the NO + X 1 + (v + = 0,N + = 0) ion. By detecting NO + ions, the photoionization cross section through the Landau levels is determined as a function of the second laser's frequency. The cross section contains broad structures and fine structures. Fourier analysis of the cross section and classical trajectory calculations of the Rydberg electron demonstrate that the broad structure is formed by the Landau level generated by the cyclotron motion of the electron around the N + = 0 core in a plane perpendicular to the field, while the fine structure is formed by the Landau level generated by the three-dimensional cyclotron motion around the excited N + = 2 core. By simulating the energy structure of the Landau level, the electron's orbital angular momentum is confirmed to be decoupled from the core rotation in the Landau levels. From the selection rules of the excitation, it is demonstrated that the Landau levels with the N + = 0 core are excited using the s character in the A 2 + state, while those with the N + = 2 core are excited using the d character. The dominant partial wave, thus determined, explains well the starting direction of the classical trajectory.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Landau levels of molecules: Angular-momentum coupling between cyclotron motion and core rotation

Kimura

Takazawa

2014

Phys. Rev. A

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Generation and Measurement of Magnetic Fields

Mielke

Schneider-Muntau

Coey

et al. 2012

Characterization of Materials

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In basic science areas, such as semiconductor physics, superconductivity, structural biology, and chemistry, magnetic fields are used as a powerful tool for analysis of matter because they can change the physical state of a system. In the presence of a magnetic field, the angular momenta (spins), the orbital motion of charged particles, and therefore the energy of the investigated physical system, are altered.Wemust realize, however, that the size of the induced effects are very modest compared to other physical quantities. One Bohr magneton (typical range of atomic magnetic moments) in a magnetic field of 10 tesla (T) (a 10 T field is ∼200,000 times the strength of the earth's magnetic field) has an energy of 0.58 meV, corresponding to a temperature of 6.7 K, a small value in comparison to room temperature. On the other hand, the generation of a magnetic field of 10Talready requires a noticeable engineering effort, with continuous fields of 50 T being the upper limit of what can be achieved today. Pulsed magnetic fields can be generated up to 100 T for durations in the millisecond range, and up to 1000 T on the microsecond time scale. Therefore, experiments must be chosen judiciously. Very often, a low‐noise sample environment, such as low mechanical vibrations, small field fluctuations (in the case of dc fields), and low temperatures are decisive to the success of scientific measurements in magnetic fields.

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Experimental setup for laser spectroscopy of molecules in a high magnetic field

Cited by 2 publications

References 61 publications

Landau levels of molecules: Angular-momentum coupling between cyclotron motion and core rotation

Landau levels of molecules: Angular-momentum coupling between cyclotron motion and core rotation

Generation and Measurement of Magnetic Fields

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