On the eventual absorption of a quantum particle
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 21 (1974) no. 1, pp. 81-87. 
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     author = {Thomas, L. C.},
     title = {On the eventual absorption of a quantum particle},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
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     publisher = {Gauthier-Villars},
     volume = {21},
     number = {1},
     year = {1974},
     mrnumber = {376034},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1974__21_1_81_0/}
}
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Thomas, L. C. On the eventual absorption of a quantum particle. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 21 (1974) no. 1, pp. 81-87. http://archive.numdam.org/item/AIHPA_1974__21_1_81_0/

[1] E.B. Davies, Quantum stochastic processes I. Comm. Math. Phys., t. 15, 1969, p. 277-304. | MR | Zbl

[2] E.B. Davies, Quantum stochastic processes III. Comm. Math. Phys., t. 22, 1970, p. 51-70. | MR | Zbl

[3] L.C. Thomas, Probabilistic calculations on the ground state of the harmonic oscillator. J. Statist. Phys., t. 7, 1973, p. 287-294.