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Phase- and helicity-dependent effects in three-color ionization

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Fifirig M., Stroe M.

Open Physics

2004

vol. 2

issue 2

266-276

We study the two-photon ionization of the hydrogen atom from its ground state by a three-color electromagnetic field consisting of a superposition of an IR laser and two of its consecutive odd harmonics of order 2p−1 and 2p+1, withp a positive integer and constant relative phase difference. The ionization process due to the net absorption of the energy 2pħω (ω being the IR laser frequency) is considered. The influence of phase difference and helicity on the azimuthal angular distribution of the ejected photoelectrons is illustrated in the case in which the two harmonics have identical polarizations. Phase effect on the alignment of the differential ionization rate is also investigated.

Dissociative excitation of HD +, D 2+, and DT + by electron impact

100%

Duca M., Fifirig M.

Open Physics

2010

vol. 8

issue 1

87-94

In the framework of the Multi-Channel Quantum Defect Theory (MQDT), a theoretical study of the dissociative excitation is presented. Numerical results for the dissociative excitation cross sections of HD +, D 2+, and DT + with electrons of energy between 2 and 12 eV are reported. The contribution of the vibrational continua of the two lowest electronic states as explicit ionization channels has been considered. Within a quasi-diabatic representation of the molecular electronic states, the Born expansion of second order is done in the K-matrix evaluation.

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2 Open Physics

1 2010

1 2004

2 Fifirig M.

1 Duca M.

1 Stroe M.

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Phase- and helicity-dependent effects in three-color ionization

Dissociative excitation of HD +, D 2+, and DT + by electron impact