We show that if the photon possesses a tiny but non-vanishing mass, the universe cannot be electrically neutral. A cosmological electric asymmetry could be generated either at an early stage by the different evaporation rates of the primordial black holes with respect to positively and negatively ...
Formulae for the total cross section of electron-positron bremsstrahlung in the center-of-mass system are given which are exact in lowest-order perturbation theory. The resulting photon spectra are compared with those of electron-electron bremsstrahlung. 机译:给出了质心系统中电子-正电子致变的总截...
elemental composition for various compounds. Different physical principles of mass separation are involved with these instruments. Importantly, both the low- and high-resolution mass spectrometers can be combined with GC. The methods also strongly overlap with respect to the amounts necessary for ...
A beam of the clusters of interest was produced and analyzed with respect to polar nature via passage through an electric quadrupole focusing field. Subsequently, the beam was ionized using electron impact and the resulting distribution of ions determined with a quadrupole mass spectrometer. Acetic ac...
is the photon’s “inertial mass” since it is similar to the inertia that one feels when trying to stop a moving mass. This may or may not be useful to consider. However, it certainly should not be confused with the concept of the ordinary mass that most people are familiar with. ...
We comment on the experimental implications of the possible existence of an electron-type neutral heavy lepton Ewith a mass around 10 GeV at the next generation of eecolliding machines with √s = 30--40 GeV. The eμ decay signal from E→ e+ μ+ ν/sub μ/ following the weak production...
6. The multi-electrode ion trap device of claim 1 wherein each interface is connectable to any one of an ionization source and a mass analyzer. 7. The device of the claim 6, wherein the ionization source comprises one of a electron ionization, a chemical ionization, a corona discharge, ...
A method of study of weakly-formed negative ions by excitation in laser light and accelerator mass spectrometry is described. Measurement of the photoelectric detachment cross section of the extra electron as a function of the photon energy gives information on the electron affinity. Absolute cross ...
A variety of ion interactions have been studied for the purpose of ion dissociation and ion transformation, including ion/neutral, ion/photon, ion/electron, and ion/ion interactions. A wide range of phenomena have been observed, many of which have been explored/developed as means for structural...
4902631Monitoring the fabrication of semiconductor devices by photon induced electron emission1990-02-20Downey et al.437/8 4843029Method of manufacturing a heteroepitaxial compound semiconductor device using photo smoothing between layer growth1989-06-27Joyce et al.437/107 ...