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The Proca equation is a generalisation of the Maxwell equations that modifies the potential of a constant charge at rest from the Coulomb to the Yukawa form and describes massive photons. In this paper, we assume time-dependent photon mass and solve the Proca equation for a charge at rest. It is found that the vector potential is non-vanishing and that the scalar potential has the form Φ (r , x 0) = f (r , x 0) / r with x 0 = c t and, thus, is space-time dependent. The solution shows that an oscillating potential pulse leaves the charge at x 0 = 0 and propagates with the speed of the light to modify the initial Yukawa potential. Experimentally the change of sign of the potential field at the charge location can be interpreted as a change of the sign of the charge. The picture that emerges from the theory is, then, that of charges that at the initial time emit massive radiation that fills the Universe. The period of the field oscillation is, however, increasing and suggests that after a long time the potential may become stabilised. A noteworthy consequence of the theory is that the present form of the Maxwell electrodynamics is only temporarily true. [ABSTRACT FROM AUTHOR]

We describe, using a semiclassical approach, the molecular dynamics of a one-dimensional H2 molecule interacting with a laser, beyond the Born­Oppenheimer approximation. We observe and discuss different molecular behaviors, such as ionization and dissociation. [ABSTRACT FROM AUTHOR]

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Copyright of Il Nuovo Cimento: B is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Il Nuovo Cimento: B is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Il Nuovo Cimento: B is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Il Nuovo Cimento: B is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The spectrum of radiation emitted by an electron colliding with a nucleus in the presence of a monochromatic laser field is calculated. The Coulomb potential is treated at all orders and the radiation is seen as spontaneous transition between two free states. The kinetic energy of the electron is T∈100−3000 eV and the laser intensity I∈10−10 W/cm; in this condition we see strong enhancement in the bremsstrahlung cross-section when the emitted frequency is an integral multiple of the laser frequency. [ABSTRACT FROM AUTHOR]

Copyright of Il Nuovo Cimento della Societa Italiana di Fisica: D is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)