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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 81 (1981), S. 261-264 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 92 (1982), S. 276-278 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 599-608 
    ISSN: 0392-6737
    Keywords: General mathematical and computational developments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta un metodo analitico iterativo per trovare una soluzione esatta dell'equazione differenziale $$i\dot a = \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{M} (t)a$$ , dove $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{M} (t)$$ è una matrice hermitiana 2×2. Il metodo si usa per risolvere il problema d'un atomo a due stati che interagisce con un campo oscillante. I risultati trovati sono confrontati con quelli ottenuti nella cosiddetta approssimazione d'onda rotante e mostrano i limiti di quest'ultima.
    Abstract: Резюме Предлагается итерационный аналитический метод для нахождения точного решения дифференциального уравнения $$i\dot a = \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{M} (t)a$$ где $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{M} (t)$$ 2×2-эрмитова матрица. Этот метод используется для решения проблемы атома с двумя состояниями, взаимодействующего с осциллирующим полем. Полученные результаты сравниваются с результатами вычислений в так называемом приблжении «вращающейся волны». Сравнение указывает пределы этой приближенной теории.
    Notes: Summary An iterative analytic method for finding an exact solution of the differential equation $$i\dot a = \overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{M} (t)a$$ , where $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{M} (t)$$ is a 2×2 hermitian matrix, is proposed. This method is used to solve the model problem of a two-state atom interacting with an oscillating field. The obtained results are compared with those obtained in the so-called rotating-wave approximation showing the limits of this approximate theory.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 405-418 
    ISSN: 0392-6737
    Keywords: General mathematical and computational developments ; Other multiple resonances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta un metodo iterativo per ottenere una soluzione esatta dell'equazione differenziale $$i\dot a = \hat H(t)a$$ , con Ĥ una matrice 3×3 hermitiana eda il vettore incognito. La procedura è particolarmente adatta ad un trattamento numerico e, come esempio, è stata applicata per trovare la probabilità d'eccitazione di un atomo a tre livelli dopo il passaggio simultaneo di due impulsi laser di cui ognuno quasi risonante con una coppia di livelli atomici.
    Abstract: Резюме Предлагается итерационный метод получения решения дифференциального уравнения $$i\dot a = \hat H(t)a$$ , где Ĥ есть эрмитова матрица 3×3a-неизвестный вектор. Предложенная процедура решеня является удобной для компьтерных вычислений. Рассматривается пример: определение вероятности возбуждения атома с тремя уровнями после синхронного прохождения двух лазерных импульсов, каждый из которых имеет почти резонансную частоту с парой атомных уровней.
    Notes: Summary An iterative method to obtain a solution of the differential equation $$i\dot a = \hat H(t)a$$ , with Ĥ a 3×3 Hermitian matrix anda the unknown vector, is proposed. The procedure is particularly suitable for computer implementation and, as an example, has been applied to find the excitation probability of a three-level atom after the synchronous passage of two laser pulses each almost resonant with a pair of atomic levels.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 547-556 
    ISSN: 0392-6737
    Keywords: Photon interactions with atoms ; Particles in electromagnetic fields (including synchrotron radiation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary 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 isT∈100−3000 eV and the laser intensityI∈1010−1013 W/cm2; in this condition we see strong enhancement in thebremsstrahlung cross-section when the emitted frequency is an integral multiple of the laser frequency.
    Type of Medium: Electronic Resource
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