abbr. SJ GMU
ISSN 2657-5841 (printed)
ISSN 2657-6988 (online)
DOI: 10.26408
Elektryczny moment dipolowy atomu He wzbudzonego poprzez zderzenie z jonem He+ – spektroskopia antykrzyżujących się poziomów
The electric dipole moment of He atom excited by he+ ion impact-anticrossing spectroscopy
Abstract:
Using the anticrossing spectroscopy, the electric dipole moment of He atoms excited by 26 keV He+ ions impact to the states of the shell n = 4 was determined. Observations of the intensity of the spectral line ?(1s4d3D – 1s2p3P) = 447 nm as a function of the intensity of axial electric field allow to determine the expectation value of the electric dipole moment: -12.5 a.u.
Streszczenie:
Wykorzystując spektroskopię antykrzyżujących się poziomów, wyznaczono elektryczne momenty dipolowe atomów He wzbudzanych do stanów z powłoki z n = 4 poprzez zderzenia z jonami He+ o energii 26 keV. Oczekiwana wartość elektrycznego momentu dipolowego, wyznaczona na podstawie obserwacji natężenia linii widmowej ?(1s4d3D – 1s2p3P) = 447 nm w funkcji natężenia osiowego pola elektrycznego, wynosi –12,5 j.a.
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14
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References:
Aynacioglu A.S., Heumann S., von Oppen G., Electric dipole moments of impact-excited He atoms, Phys. Rev. Lett. 64, 1879, 1990.
Baszanowska E., Drozdowski R., Kamiński P., von Oppen G., The spectroscopy of the electron transitions in helium atoms induced by the collisions with helium atoms in the intermediate energy range, Zeszyty Naukowe Akademii Morskiej w Gdyni, 60, 128, Gdynia 2009.
Busch M., Drozdowski R., Ludwig Th., von Oppen G., Anticrossing spectroscopy of He atoms excited by 30-300 keV He+ impact, J. Phys. B: At. Mol. Opt., 37, 1, 2004.
Büttrich S., Gildemeister D., Thuy M-J., Tschersich M., Skogvall B., von Oppen G., Drozdowski R., Charge distribution of He I states excited by 10-50 keV proton impact: a study of electron promotion in an atomic Paul trap, J. Phys. B: At. Mol. Opt. Phys. 31, 2709, 1998.
Drozdowski R., Cascade feeding of the 1s3d 3D level of He I from high-l states excited by proton impact, Eur. Phys. J. D 23, 73, 2003.
Drozdowski R., Wzbudzanie atomów He w zderzeniach z jonami w zakresie energii pośrednich, Wydawnictwo Uniwersytetu Gdańskiego, Gdańsk 2004.
Drozdowski R., Thuy M., Tschersich M., Skogvall B., von Oppen G., Excitation of He atoms by 50-500 keV proton impact: from Paul-trap promotion to the high-energy limit, J. Phys. B: At. Mol. Opt. Phys. 32, 397, 1999.
Eck T.G., Coherent Excitation of S and P States of the n=2 Term of Atomic Hydrogen, Phys. Rev. Lett. 31, 270, 1973.
Hasselkamp D., Hippler R., Sharman A., Schartner K-H., Absolute excitation cross sections for the 41S-, 41D- and 31P- levels of helium excited by fast protons, Z. Physik, 248, 254, 1971.
Hasselkamp D., Hippler R., Sharman A., Schartner K-H., Cross sections for the excitation of the 41S-, 41D- and 31P-levels of helium excited by fas He+ -ions, Z. Physik, 257, 43, 1972.
Okasaka R., Konishi Y., Sato Y., Fukuda K., Excitation cross sections in He+-He collisions: I. Excitation function and potential curve crossing, J. Phys. B: At. Mol. Opt. Phys., 20, 3771, 1987.
Sellin L.A., Mowat R.J., Peterson R.S., Griffin P.M., Laubert R., Haselton H.H., Observation of Coherent Electron-Density-Distribution Oscillations in Collision-Averaged Foil Excitation of the n=2 Hydrogen Levels, Phys. Rev. Lett. 31, 1335, 1973.
Van den Bos J., Winter G.J., de Heer F.J., Excitation of helium by protons in the 1–150 keV region, Physica, 40, 357, 1968.
Wieder H., Eck T.G., Anticrossing Signals in Resonance Fluorescence, Phys. Rev. 153, 103, 1967.
Wolterbeek Muller L., de Heer F.J., Electron capture into excited states by helium ions incident on noble gases, Physica, 48, 345, 1970.