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[en] The possibility of influencing nuclear beta decay with high intensity optical lasers is examined numerically with the appropriate exact wave functions of a Dirac electron in a plane-wave field. The total β-decay rate for 3H is found to be unaffected by the laser field for a 2-eV laser with intensities in the range 1018-1020 W/cm2
[en] Highlights: • The BF4−n(R)n- anions (R = CH3, C2H5; n = 1–4) were studied at the OVGF level of theory. • All BF4−n(CH3)n- and BF4−n(C2H5)n- anions were found to be thermodynamically stable. • The VDE values calculated for the BF4−n(R)n- anions exceed 4 eV in all cases. • The smallest VDEs were found for the B(C2H5)4- (4.27 eV) and B(CH3)4- (4.42 eV). - Abstract: The properties of the BF4−n(R)n- anions (where R = CH3, C2H5 and n = 1–4) were investigated at the ab initio OVGF/6-311++G(3df,3pd)//MP2/6-311++G(d,p) level of theory. It is shown that subsequent replacement of the fluorine ligands with alkyl groups in the BF4- superhalogen anion results in a substantial electronic stability decrease (by 1.13–3.42 eV), however, even the fully substituted B(CH3)4- and B(C2H5)4- anions remain stable and relatively strongly bound (by ca. 4.3–4.4 eV) negatively charged systems. The presence of four substituents bound to the boron atom is identified as the most important factor that enables the existence and stability of the BF4−n(R)n- anions
[en] The development of a UV reflection anisotropy spectrometer has extended the current range of the reflection anisotropy spectrometry (RAS) technique to 7.0 eV. The extra range has been used to obtain the RAS of the Au(1 1 0)/electrolyte interface to 7.0 eV. The RA spectrum obtained for this interface is significantly different in the range 4.6 to 5.5 eV from the results obtained with the conventional instrument.
[en] We have performed SH spectroscopy on a reconstructed Au(1 0 0) 5 x 20 surface. We found a broad SH intensity continuum for the SH photon energy from 2ℎω = 2.2 to 4.2 eV. Between the photon energies 2ℎω = 3.7 and 4.2 eV, the SH intensity in the s-in/p-out (s-polarized input/p-polarized output) polarization configuration is stronger than that in p-in/p-out polarization configuration, but the former signal disappeared when the surface was exposed to air. Surface electronic states are suggested to contribute to the SH response in this photon energy region