The existence of novel electrostatic solitary pulses in an electron-positron plasmas with two distinct groups of positrons is demonstrated. It is found that the soliton potential can assume both the rarefactive and compressive polarities. The results might be useful in understanding the properties of localized disturbances in astrophysical plasmas.
It is shown that the equations governing the dynamics of weakly interacting medium-frequency electrostatic waves in a nonuniform magnetoplasma with a fixed ion background can have localized vortex chain solutions.
The temperature and pressure dependences of 35 Cl nuclear quadrupole resonance (NQR) frequency and spin-lattice relaxation time (T 1 ) were investigated for 1-chloro-2,4-dinitrobenzene and 1,2-dichloro-3-nitrobenzene. T 1 was measured in the temperature range 77-300 K. Furthermore, the NQR frequency (n) and T 1 for these compounds were measured as a function of pressure up to 5.1 kbar at 300 K. Relaxation was found to be due to the torsional motion of the molecule and the reorientation motion of the nitro group. By analysing the temperature dependence of T 1 , the activation energy for the reorientation motion of the nitro group was obtained. The temperature dependence of the average torsional lifetimes of the molecules and the transition probabilities W 1 and W 2 for the 1m = ±1 and 1m = ±2 transitions, were also obtained. Both compounds showed a non-linear variation of NQR frequency with pressure. The pressure coefficients were observed to be positive. A thermodynamic analysis of the data was carried out to determine the constant-volume temperature coefficients of the NQR frequency. The spin-lattice relaxation time T 1 for both the compounds was found to be weakly dependent on pressure, showing that the relaxation is mainly due to the torsional motions.
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