Virtual state (original) (raw)
الحالة المجازية (بالإنجليزية: Virtual state) في الفيزياء تصف حالة وسطية لأحد الأنظمة المكونة من عدة جسيمات . وقد تصف حالة كمومية تظهر لفترة قصيرة جدا لا يمكن رؤيتها أو حالة حقيقية لكنها غير مستقرة.
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| dbo:abstract | الحالة المجازية (بالإنجليزية: Virtual state) في الفيزياء تصف حالة وسطية لأحد الأنظمة المكونة من عدة جسيمات . وقد تصف حالة كمومية تظهر لفترة قصيرة جدا لا يمكن رؤيتها أو حالة حقيقية لكنها غير مستقرة. (ar) In quantum physics, a virtual state is a very short-lived, unobservable quantum state. In many quantum processes a virtual state is an intermediate state, sometimes described as "imaginary" in a multi-step process that mediates otherwise forbidden transitions. Since virtual states are not eigenfunctions of any operator, normal parameters such as occupation, energy and lifetime need to be qualified. No measurement of a system will show one to be occupied, but they still have lifetimes derived from uncertainty relations. While each virtual state has an associated energy, no direct measurement of its energy is possible but various approaches have been used to make some measurements (for example see and related work on virtual state spectroscopy) or extract other parameters using measurement techniques that depend upon the virtual state's lifetime. The concept is quite general and can be used to predict and describe experimental results in many areas including Raman spectroscopy, non-linear optics generally, various types of photochemistry, and nuclear processes. (en) |
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| rdfs:comment | الحالة المجازية (بالإنجليزية: Virtual state) في الفيزياء تصف حالة وسطية لأحد الأنظمة المكونة من عدة جسيمات . وقد تصف حالة كمومية تظهر لفترة قصيرة جدا لا يمكن رؤيتها أو حالة حقيقية لكنها غير مستقرة. (ar) In quantum physics, a virtual state is a very short-lived, unobservable quantum state. In many quantum processes a virtual state is an intermediate state, sometimes described as "imaginary" in a multi-step process that mediates otherwise forbidden transitions. Since virtual states are not eigenfunctions of any operator, normal parameters such as occupation, energy and lifetime need to be qualified. No measurement of a system will show one to be occupied, but they still have lifetimes derived from uncertainty relations. While each virtual state has an associated energy, no direct measurement of its energy is possible but various approaches have been used to make some measurements (for example see and related work on virtual state spectroscopy) or extract other parameters using measurement t (en) |
| rdfs:label | حالة مجازية (ar) Virtual state (en) |
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