Ultrafast Magnetization of a Dense Molecular Gas with an Optical Centrifuge

Milner, A.; Korobenko, Aleksey; Milner, Valery

doi:10.1103/physrevlett.118.243201

Cited by 22 publications

(23 citation statements)

References 27 publications

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“…This stability of superrotor rotations with respect to collisions was indeed observed experimentally with nitrogen and oxygen superrotors at ambient conditions [10,12,13,18]. Classical simulations of a gas of superrotors show that, while the high rotation rates are conserved initially, they rapidly relax towards thermal equilibrium once the rotational-translational energy exchange becomes relevant [19,20].…”

Section: Introductionsupporting

confidence: 67%

Rotational Alignment Decay and Decoherence of Molecular Superrotors

Stickler¹,

Ghahramani²,

Hornberger³

2018

Phys. Rev. Lett.

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We present the quantum master equation describing the coherent and incoherent dynamics of a rapidly rotating molecule in presence of a thermal background gas. The master equation relates the rate of rotational alignment decay and decoherence to the microscopic scattering amplitudes, which we calculate for anisotropic van der Waals scattering. For large rotational energies, we find excellent agreement of the resulting alignment decay rate with recent superrotor experiments. arXiv:1806.09921v1 [quant-ph]

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Section: Introductionsupporting

confidence: 67%

Rotational Alignment Decay and Decoherence of Molecular Superrotors

Stickler¹,

Ghahramani²,

Hornberger³

2018

Phys. Rev. Lett.

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“…For highly rotating states, the centrifugal force may lead to the stretching of bonds [35] or even to dissociation [32]. Furthermore, it has been shown that an ensemble of superrotors is stable against collisions [34,36,37], which allows to measure the spinrotation coupling [38], the interaction with a magnetic field [39][40][41] or may also cause magnetization in an ensemble of paramagnetic superrotors [42].…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of asymmetric super-rotors: Alignment and orientation

Omiste

2018

Phys. Rev. A

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We report a theoretical study of the optical centrifuge acceleration of an asymmetric top molecule interacting with an electric static field by solving the time-dependent Schrödinger equation in the rigid rotor approximation. A detailed analysis of the mixing of the angular momentum in both the molecular and the laboratory fixed frames allow us to deepen the understanding of the main features of the acceleration process, for instance, the effective angular frequency of the molecule at the end of the pulse. In addition, we prove numerically that the asymmetric superrotors rotate around one internal axis and that their dynamics is confined to the plane defined by the polarization axis of the laser, in agreement with experimental findings. Furthermore, we consider the orientation patterns induced by the dc field, showing the characteristics of their structure as a function of the strength of the static field and the initial configuration of the fields.

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“…The timedependent magnetization creates a current in a pick-up coil (2 mm diameter, 5 mm long, 4.5 turn) through the voltage (EMF), which is used to determine the number of spin-polarized atoms generated by the photodissociation, similar to recent experiments by Milner et al in the measurement of electron-spin-polarized O 2 molecules. [14]. We vary the photodissociation laser intensity by several orders of magnitude, by drastically changing the focusing conditions, and show that nearly all of the molecules in the laser focus can be dissociated, leading to densities of 10 19 cm −3 .…”

mentioning

confidence: 96%

Ultrahigh-Density Spin-Polarized H and D Observed via Magnetization Quantum Beats

et al. 2018

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We measure nuclear and electron spin-polarized H and D densities of at least 10^{19} cm^{-3} with ∼10 ns lifetimes, from the photodissociation of HBr and DI with circularly polarized UV light pulses. This density is ∼6 orders of magnitude higher than that produced by conventional continuous-production methods and, surprisingly, at least 100 times higher than expected densities for this photodissociation method. We observe the hyperfine quantum beating of the H and D magnetization with a pickup coil, i.e., the respective 0.7 and 3 ns periodic transfer of polarization from the electrons to the nuclei and back. The 10^{19} cm^{-3} spin-polarized H and D density is sufficient for laser-driven ion acceleration of spin-polarized electrons, protons, or deuterons, the preparation of nuclear-spin-polarized molecules, and the demonstration of spin-polarized D-T or D-^{3}He laser fusion, for which a reactivity enhancement of ∼50% is expected.

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Ultrafast Magnetization of a Dense Molecular Gas with an Optical Centrifuge

Cited by 22 publications

References 27 publications

Rotational Alignment Decay and Decoherence of Molecular Superrotors

Rotational Alignment Decay and Decoherence of Molecular Superrotors

Theoretical study of asymmetric super-rotors: Alignment and orientation

Ultrahigh-Density Spin-Polarized H and D Observed via Magnetization Quantum Beats

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