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День добрый, Электрон с энергией E = 4 эВ движется в положительном направлении оси x, встречая на своем пути прямоугольный потенциальный барьер высоты U = 10 эВ и шириной l = 0,1 нм. Определить коэффициент D прозрачности потенциального барьера.
Коэффициент прозрачности барьера прямоугольной формы определяется по формуле D = D0 ∙ exp{-2l/h* ∙ √[2m(U – E)]}, где D0 слабо изменяется с изменением l, E, U. В большинстве случаев можно считать D0 ≈ 1. Подстановка в эту формулу численных значений величин дает (при h* = h/(2π), h – постоянная Планка) D = 1 ∙ exp{-2 ∙ 0,1 ∙ 10-9/(1,055 ∙ 10-34) ∙ √[2 ∙ 0,911 ∙ 10-30 ∙ (10 ∙ 1,6 ∙ 10-19 – 4 ∙ 1,6 ∙ 10-19)]}≈ 0,081.
Гордиенко Андрей Владимирович: Что-то меня смущает фраза
Например, на Википедии (просто ничего более дельного под руку не попалось, если у Вас есть более дельные источники, не согласующиеся с содержимым статьи, возражать не буду) дано выражение для этой величины
что в переводе на текущие обозначения при подстановке данных даёт D0=16E(U-E)/U2=3,84
Химик CH: Взял формулу и пояснение к ней из пособия Маскевич С. А. Атомная физика. Практикум по решению задач: учеб. пособие. - Минск: Выш. шк., 2010. - 455 с. на странице 142...
Гордиенко Андрей Владимирович: Таким источникам есть смысл доверять в двух случаях а) дана ссылка на нормальный материал (не нашёл) б) можно повторить вывод (некогда было) Если что-то не то, всегда есть вероятность, что не правильно совместили данные нескольких источников или что-то не довели до конца (или переписали с ошибками) Как-то дали на занятиях (подготовка к олимпиаде) задание построить в Экселе распределение молекул по скоростям при нескольких значениях температуры. Так тогда и не понял, как эти графики умудрились ограничивать заведомо разные площади. Оказалось распределение Максвелла с ошибкой дали - вместо полуторной степени квадратный корень. С тех пор формулы стараюсь перепроверять.
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