Transcription of Harmonic Oscillator Physics - Reed College
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Harmonic Oscillator Physics - Reed College
Physics 342 Lecture 9. Harmonic Oscillator Physics Lecture 9. Physics 342. Quantum Mechanics I. Friday, February 12th, 2010. For the Harmonic Oscillator potential in the time-independent Schro dinger equation: 1 2 d (x). 2.. ~ + m x (x) = E (x), 2 2 2. ( ). 2m dx2. we found a ground state m x2. 0 (x) = A e 2~ ( ). with energy E0 = 1. 2 ~ . Using the raising and lowering operators 1. a+ = ( i p + m x). 2~m . ( ). 1. a = (i p + m x), 2~m . we found we could construct additional solutions with increasing energy using a+ , and we could take a state at a particular energy E and construct solutions with lower energy using a . The existence of a minimum energy state ensured that no solutions could have negative energy and was used to define 0 1 : 1.. a 0 = 0 H (a+ 0 ) =. n + n ~ an+ 0 . ( ). 2. The operators a+ and a are Hermitian conjugates of one another for any 1.
as a power series expansion (described in Gri ths), and we won’t re-live that argument (yet). But it is important to understand the connection between the algebraic, operational approach and the brute force series expansion. Starting from the ground state, let’s act …
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