Summary
The theoretical treatment of the one-step multiphoton ionization of atoms in strong fields is extended to include the effects of the field fluctuations. In particular, the case of a field with chaotic fluctuations (namely, with Gaussian distributions of both the field amplitude and phase) is worked out in detail and application is presented to the ionization of hydrogen. The results suggest that the inclusion of the field statistical properties remarkably modifies the findings obtained for the case of a coherent field, the modifications going, as a rule, in the direction of a better agreement with the experimental results. Thus, improvements in the description of the statistical properties of a strong radiation field should be considered as important as the accurate account of the atomic structure and of the dynamics of the ionization process.
Riassunto
Il trattamento teorico della ionizzazione multifotonica a un passo in campi intensi viene esteso per includere gli effetti dovuti alle fluttuazioni del campo. In particolare, viene alaborato in dettaglio il caso di un campo con fluttuazioni aventi una statistica caotica (cioè con distribuzioni gaussiane sia dell'ampiezza che della fase del campo) e vengono presentate delle applicazioni al caso della ionizzazione dell'atomo di idrogeno. I risultati suggeriscono che l'inclusione delle proprietà statistiche del campo modifica in modo notevole i risultati ottenuti per il caso di un campo coerente, e le modifiche vanno generalmente verso un migliore accordo con i risultati sperimentali. Così, i miglioramenti nella descrizione dell proprietà statistiche di un campo di rediazione intensa devono essere considerati importanti tanto quanto una descrizione accurata della struttura atomica e della dinamica del processo di ionizzazione.
Резюме
Теоретичекое рассмотрение одно-ступенчатой многофотонной ионизации атомов в сильных полях обобщается, чтобы включить эффекты флуктуаций лоля. В частности, подробно исследуется случай поля с хаотическими флуктуациями (с гауссовыми распределениями амплитуды и фазы поля). Предлагается пример для ионизации водорода. Полученные результаты показывают, что учет статистических свойств поля существенно изменяет предсказания по сравнению со случаем когерентного поля, причем изменения, как правило, направлены на улучшение согласия с экспериментальными результатами. таким образом, уточнения при описании статистических свойств сильного поля излучения являются так же важыми, как точый учет атомной структуры и динамики процесса ионизации.
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Basile, S., Ferrante, G. & Trombetta, F. High-intensity multiphoton ionization of atoms and radiation properties. Chaotic field effects. Il Nuovo Cimento D 12, 303–322 (1990). https://doi.org/10.1007/BF02450898
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DOI: https://doi.org/10.1007/BF02450898