Atomic hydrogen-deuterium mixtures at 1 kelvin: Recombination rates, spin-exchange cross sections, and solvation energies

Hayden, M. E.; Hardy, W. N.

doi:10.1007/bf00753562

Cited by 24 publications

(9 citation statements)

References 48 publications

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“…Even at ultralow temperature like the present case, the reactivity difference among hydrogen isotopes cannot be expected because the recombination is a no-barrier radical-radical reaction. The recent experiment by Hyden et al 13 at ultralow temperature supports the aforementioned prediction. They determined the gas-phase recombination reaction rate constants k HD and k DD for H + D + 4 He f HD + 4 He and D + D + 4 He f D 2 + 4 He in the superfluid helium-coated wall under zero magnetic field at ∼1 K. They obtained k H•D /k D•D ) 1.03.…”

Section: Resultssupporting

confidence: 69%

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Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H₂ and D₂ in Superfluid and Normal-Fluid ³He−⁴He Media at 1.3 K

et al. 1998

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The abstraction reactions, T + HD(DH) f HT(DT) + D(H) and T + H 2 (D 2 ) f HT(DT) + H(D) were studied experimentally in liquid 3 He-4 He media at 1.3 K and theoretically using the gas-phase reaction model. The experimental reaction system has two characteristics; one is that the tritium atom (T) is produced from one of the constituents, 3 He, through 3 He(n, p)T nuclear reaction, and the other is that superfluid or normalfluid reaction medium can be chosen arbitrarily by changing the composition and temperature of the sample. The experimental isotope effect defined by {[HT]/[H 2 ]}/{[DT]/[D 2 ]} for the reactions T + H 2 (D 2 ) f HT-(DT) + H(D) was found to be 158 in superfluid and 146 in normal-fluid solutions. The large isotope effects observed were qualitatively explained via quantum mechanical tunneling on the basis of the theoretical calculations of thermal rate constants for these reactions. In the T + HD(DH) f HT(DT) + D(H) reactions, the experimental isotope effect was <19.8. From the considerations on both the reaction processes based on the experimental results and the theoretical calculations, it has been suggested that the quantum mechanical tunneling abstraction through van der Waals complex plays a predominant role for both the reactions.

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Section: Resultssupporting

confidence: 69%

“…Table 3) and the concentration of the impurity D 2 is much smaller than that of HD, k 13 [T][D 2 ] can be neglected in eq 16. However, k 11 [T][H 2 ] may be the same order of magnitude as k 10 [T][HD] because k 11 is expected to be large in Table 3.…”

Section: Consideration Of Reactionmentioning

confidence: 99%

Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H₂ and D₂ in Superfluid and Normal-Fluid ³He−⁴He Media at 1.3 K

et al. 1998

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“…When cavity is detuned from the atomic transition frequency, the field radiated by the atoms is phase shifted relative to the field in the cavity. The Bloch vector precesses about the total field leading to a phase shift proportional to m 0h m 2 B Nvd͑͞d 2 1 G 2 ͒ V cav [15]. Here, N is the number of atoms, v is the transition frequency, d is the cavity detuning, G is the cavity HWHM, V cav is the effective cavity volume, and m B is the Bohr magneton.…”

mentioning

confidence: 99%

Measurement and Cancellation of the Cold Collision Frequency Shift in an87RbFountain Clock

2000

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We measure a cold collision frequency shift in an 87Rb fountain clock that is fractionally 30 times smaller than that for Cs. The shift is -0.38(8) mHz for a density of 1.0(6)x10(9) cm(-3). We study the cavity pulling of the atomic transition and use it to cancel the cold collision shift. We also measure the partial frequency shifts of each clock state finding 2(lambda(10)-lambda(20))/(lambda(10)+lambda(20)) = 0.1(6).

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“…By applying a radiofrequency (RF) magnetic field, B 1 , at a specific frequency we can drive transitions between the singlet and the triplet states. The S → T ± (S → T 0 ) is an allowed transition when B 1 has a component perpendicular (parallel) to B 0 , and this remains true in the limit where B 0 = 0 [23]. At the fields used in this work (B 0 < 25 µT) the S → T 0 transition frequency is essentially constant, since it is a clock transition, while the S → T ± transition frequencies vary linearly with B 0 .…”

Section: Phosphorus Donor Systemmentioning

confidence: 74%

Zero-field optical magnetic resonance study of phosphorus donors in 28-silicon

et al. 2018

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Donor spins in silicon are some of the most promising qubits for upcoming solid-state quantum technologies. The nuclear spins of phosphorus donors in enriched silicon have among the longest coherence times of any solid-state system as well as simultaneous qubit initialization, manipulation and readout fidelities near ∼ 99.9%. Here we characterize the phosphorus in silicon system in the regime of "zero" magnetic field, where a singlet-triplet spin clock transition can be accessed, using laser spectroscopy and magnetic resonance methods. We show the system can be optically hyperpolarized and has ∼ 10 s Hahn echo coherence times, even at Earth's magnetic field and below.

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Atomic hydrogen-deuterium mixtures at 1 kelvin: Recombination rates, spin-exchange cross sections, and solvation energies

Cited by 24 publications

References 48 publications

Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H₂ and D₂ in Superfluid and Normal-Fluid ³He−⁴He Media at 1.3 K

Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H₂ and D₂ in Superfluid and Normal-Fluid ³He−⁴He Media at 1.3 K

Measurement and Cancellation of the Cold Collision Frequency Shift in an87RbFountain Clock

Zero-field optical magnetic resonance study of phosphorus donors in 28-silicon

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Atomic hydrogen-deuterium mixtures at 1 kelvin: Recombination rates, spin-exchange cross sections, and solvation energies

Cited by 24 publications

References 48 publications

Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H2 and D2 in Superfluid and Normal-Fluid 3He−4He Media at 1.3 K

Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H2 and D2 in Superfluid and Normal-Fluid 3He−4He Media at 1.3 K

Measurement and Cancellation of the Cold Collision Frequency Shift in an87RbFountain Clock

Zero-field optical magnetic resonance study of phosphorus donors in 28-silicon

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Product

Resources

About

Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H₂ and D₂ in Superfluid and Normal-Fluid ³He−⁴He Media at 1.3 K

Tunneling Abstraction Reactions of Tritium Atoms with HD and with Mixtures of H₂ and D₂ in Superfluid and Normal-Fluid ³He−⁴He Media at 1.3 K