41 research outputs found
On spin-rotation contribution to nuclear spin conversion in C_{3v}-symmetry molecules. Application to CH_3F
The symmetrized contribution of E-type spin-rotation interaction to
conversion between spin modifications of E- and A_1-types in molecules with
C_{3v}-symmetry is considered. Using the high-J descending of collisional
broadening for accidental rotational resonances between these spin
modifications, it was possible to co-ordinate the theoretical description of
the conversion with (updated) experimental data for two carbon-substituted
isotopes of fluoromethane. As a result, both E-type spin-rotation constants are
obtained. They are roughly one and a half times more than the corresponding
constants for (deutero)methane.Comment: 13 pages with single-spacing, REVTeX, no figures, accepted for
publication in <J. Phys. B
Coherent control of nuclear spin isomers of molecules: The role of molecular motion
Molecular center-of-mass motion is taken into account in the theory of
coherent control of nuclear spin isomers of molecules. It is shown that
infrared radiation resonant to the molecular rovibrational transition can
substantially enrich nuclear spin isomers and speed up their conversion rate.Comment: REVTEX, 13 pages + 3 eps figure
Burning the DT-plasma with inert impurities and non-cryogenic ICF-target with solid fuel
The ignition criterion, ignition energy and gain of DT-plasma of ICF-target in the presence of impurities of light atoms such as beryllium, carbon and lithium at their arbitrary concentration are found. It is shown that the most promising type of non-cryogenic solid thermonuclear fuel is DT-hydride of beryllium (BeDT). It is suggested to apply the targets with such a fuel as: (1) Fast-ignited ICF-target at the ignition energy of 25–50 kJ and compression driver energy of 2–3 MJ; (2) ICF-target spark-ignited by 15–20 MJ heavy ion driver; (3) Spark-ignited target by 5–7 MJ laser as a neutron source for hybrid fusion-fission