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Energy dependence of collisionless multiphoton ionization of D2O molecules by a TEA‐CO2 laser
1.See for example the following review articles: J. A. Bakos, Adv. Electron. Phys. 36, 57 (1974);
1.P. Lambropoulos, Adv. At. Mol. Phys. 12, 87 (1976).
2.Lompre, Mainfray, and Manus have attempted recently to ionize argon atoms using a laser with intensity up to to check the tunnelling effect as opposed to multiphoton ionization. They did not observed any significant ionization. This work was presented at The International Processes, Rochester, N.Y., 1977.
3.V. M. Akulin, S. S. Alimpiev, N. V. Karpov, Yu.N. Petrov, A. M. Prokhorov, and L. A. Sheliepin, JETP Lett. 22, 45–46 (1975).
4.N. V. Karlov, N. A. Karpov, Yu.N. Petrov, A. M. Prokhorov, and L. V. Shelepin, Sov. Phys.‐Dokl. 21, 32–33 (1976).
5.S. L. Chin, Phys. Lett. A 61, 311–313 (1977).
6.S. L. Chin, Can. J. Phys. 48, 1314–1317 (1970).
7.Two other “pieces” of evidence are the following: (a) after a series of experiments, we turned off the water vapor and waited for 30 sec so that the pressure in the focal region decreased to nearly the background pressure. We again shot the laser into the system. No ions were observed. Should the ions come from the surfaces, we would have observed them. This was because water molecules adhere strongly to surfaces in the vacuum system forming a rather thick molecular layer. Usually, the system has to be baked for a few hours in order to drive off the water molecules. (2) If the hole at the first collecting ground electrode was closed, no ions were observed.
8.J. R. Izatt, C. J. Budhiraja, and P. Mathieu, IEEE J. Quantum Electron. QE‐13, 396–398 (1977).
9.M. C. Gower and K. W. Billman, Appl. Phys. Lett. 30, 514–516 (1977).
10.S. C. Abbi and H. Mahr, Phys. Rev. Lett. 26, 604 (1971);
10.S. L. Chin, Phys. Rev. A 5, 2303–2305 (1972).
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