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ASEAN Journal of Scientific and Technological Reports

อนทกรลตามเสนทางสำหรบกำแพงศกยอนนต

อัฏฐชัย ถาวรสุวรรณ, วิทยา ทิพย์อักษร, นิคม ชูศิริ

Published Sep 21, 2016• 0 citations
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Abstract

บทความนี้ศึกษาปัญหากำแพงศักย์อนันต์ในหนึ่งมิติโดยอาศัยวิธีอินทิกรัลตามเส้นทางของฟายน์แมน ได้คำนวณ ตัวแผ่กระจายสำหรับกำแพงศักย์อนันต์โดยวิธีอินทิกรัลตามเส้นทางแบบลากรางเกียน ผลเฉลยที่ได้อาศัยวิธีจุดภาพ กระจกเงาซึ่งสมมูลกับการรวมเส้นทางแบบฉบับ ตัวแผ่กระจายที่ได้อยู่ในรูปแบบที่กระชับ และจากตัวแผ่กระจายดังกล่าว สามารถนำไปคำนวณหาสถานะเจาะจงโมเมนตัมและระดับพลังงานที่เป็นไปได้ของอนุภาคที่อยู่ภายใต้อิทธิพลของกำแพง ศักย์อนันต์ได้ In this paper we study an infinite potential barrier problem in one dimension using Feynman path integral approach. The propagator for the infinite potential barrier is calculated by means of the Lagrangian path integral. This solution uses an image-point method equivalent to a sum over classical paths. The propagator is evaluated in a closed form, and from this propagator we obtained the momentum eigenstates and possible energy levels of a particle under the influence of an infinite potential barrier.

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บทความนี้ศึกษาปัญหากำแพงศักย์อนันต์ในหนึ่งมิติโดยอาศัยวิธีอินทิกรัลตามเส้นทางของฟายน์แมน ได้คำนวณ ตัวแผ่กระจายสำหรับกำแพงศักย์อนันต์โดยวิธีอินทิกรัลตามเส้นทางแบบลากรางเกียน ผลเฉลยที่ได้อาศัยวิธีจุดภาพ กระจกเงาซึ่งสมมูลกับการรวมเส้นทางแบบฉบับ ตัวแผ่กระจายที่ได้อยู่ในรูปแบบที่กระชับ และจากตัวแผ่กระจายดังกล่าว สามารถนำไปคำนวณหาสถานะเจาะจงโมเมนตัมและระดับพลังงานที่เป็นไปได้ของอนุภาคที่อยู่ภายใต้อิทธิพลของกำแพง ศักย์อนันต์ได้ In this paper we study an infinite potential barrier problem in one dimension using Feynman path integral approach. The propagator for the infinite potential barrier is calculated by means of the Lagrangian path integral. This solution uses an image-point method equivalent to a sum over classical paths. The propagator is evaluated in a closed form, and from this propagator we obtained the momentum eigenstates and possible energy levels of a particle under the influence of an infinite potential barrier.
It is proposed that each of several analytical techniques used to evaluate the path integral when a spinless particle encounters an infinite potential barrier relies on more constraints than is necessary. We review the image, forbidden-paths, and eigenfunction-expansion methods, and the infinitesimal-propagator method is developed herein. It is then shown that the latter two methods contain assumptions leading to extra terms in the path-integral integrand which serve only to aid in the analytical evaluation of the path integral but which do not affect the outcome of that evaluation. The analytical arguments are further confirmed by a recently developed numerical method that, for a limited number of cases, is a direct evaluation of the path integral.
Based on the equivalence between momentum representation and coordinate representation,an alternative method is presented,where the momentum representation and the Feynman's path integral are employed to calculate the propagator function of a particle in a constant force field,then the result is transformed into the coordinate representation. We present a way to solve the Feynman's path integral,which exhibits the high value of momentum representation if the solution of one- dimensional motion of a particle in a constant force field.