Use the WKB method, and Bohr-Sommerfeld quantization, to estimate the matrix element (leftlangle 2left|exp left(-a partial_{x} ight)

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Use the WKB method, and Bohr-Sommerfeld quantization, to estimate the matrix element \(\left\langle 2\left|\exp \left(-a \partial_{x}\right)\right| 1\rightangle\) for a harmonic oscillator.

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