Interferences between En and Mn (n = 1, 2...) optical transition moments

Abstract

The operator for interaction between monochromatic electromagnetic field (light) and molecules is usually presented as a two multipolar series % truncated expansions $V^{E1}+V^{E2}+...$ (electro-dipole, electro-quadrupole,...) and $V^{M1}+V^{M2}+...$ (magneto-dipole, magneto-quadrupole, ...). The optical transition probability is proportional to the complex square of the sum of these series, which contains interference terms like $V^{En}{V}^{E{n}^{\prime }}$, $V^{Mn}{V}^{M{n}^{\prime }}$, and $V^{Ep}{V}^{Mk}$ ($n\ne n^{\prime }$). In the present study it is shown that all of terms $V^{Ep}{V}^{Mk}$ may be observed experimentally, if the the molecules are oriented, electrically and magnetically, and the light with appropriate phase shift between electric and magnetic fields. Also, a simple operator for the light-molecule interactions is proposed, as an alternative to Taylor series mentioned above.

12 pages, 1 figure

References in corpus (4)

• Photoelectron angular distributions from strong-field ionization of oriented molecules
• Field-free orientation of CO molecules by femtosecond two-color laser fields
• Origin-independent calculation of quadrupole intensities in X-ray spectroscopy
• Multipole (E1, M1, E2, M2, E3, M3) transition wavelengths and rates between 3l5l' excited and ground states in nickel-like ions