We present results of the first measurements of density, shock speed and particle speed in compressed liquid deuterium at pressures in excess of 1 Mbar. We have performed equation of state (EOS) measurements on the principal Hugoniot of liquid deuterium from 0.2 to 2 Mbar. We employ high-resolution radiography to simultaneously measure the shock and particle speeds in the deuterium, as well as to directly measure the compression of the sample. We are also attempting to measure the color temperature of the shocked D2. Key to this effort is the development and implementation of interferometric methods in order to carefully characterize the profile and steadiness of the shock and the level of preheat in the samples. These experiments allow us to differentiate between the accepted EOS model for D2 and a new model which includes the effects of molecular dissociation on the EOS.

No abstract

No abstract

No abstract

No abstract

The Jϭ0→2 Raman signal from solid Jϭ0 D 2 or H 2 reveals the hcp structure when deposited at a rate 0.1рR͑m/min͒р40 onto MgF 2 at T d /T tp Ͼ0.3, a mixture of hcp and fcc crystals at 0.2ϽT d /T tp Ͻ0.3 and possibly a randomly stacked close-packed structure at T d /T tp Ͻ0.2, where T tp is the triple point temperature. Non-hcp crystals transform to hcp continuously and irreversibly with increasing T. Finally, the crystal size decreases with decreasing T d and increasing R, from ϳ1 mm at T d ϳ0.8T tp and Rϳ2 m/min to ϳ1 m at 0.25 T tp and Rϳ40 m/min.

J = 1 to J =0 molecular rotational time constants for J =1 D2 in solid D-T at 1.8 to 14 K have been obtained by analyzing the longitudinal relaxation times T& of the tritons in the same sample. The inherent time constant in the electric quadrupole theory of T& is a function of both the J =1 T2 and J =1 D2 concentrations. By subtracting out the J = 1 T2 behavior as obtained from pure T2 samples, the J = 1 to J =0 D2 time constants remain. From 10 to 14 K, the D2 time constants are longer than those for Tã t constant temperature by the ratio of the nuclear magnetic moments. From 1.8 to 5.3 K, the two time constants are identical at about 5 h. A time-constant minimum occurs at about 10 K for both hydrogens. A rate-equation theory of rotational catalysis by free hydrogen atoms created by the tritium radioactivity is presented.

This corrects the article DOI: 10.1103/PhysRevLett.108.065701.