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| 1.
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論文
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Takezawa, S. ; Iida, Y.
概要:
application/pdf<br />Departmental Bulletin Paper<br />When a localized perturbation takes place in the Rydberg series, t
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he quantum defect δn of the series shows a value deviated from the normal one of the series. In the homogenous perturbation between Rydberg states (II^-) the electro-vibronic levels show an appearance without any perturbations, even if it exists, because of having the similar rotational constants. The plots of the rotaional levels T(υ, J) against J(J+1) are not crossed, but parallel. The energy shifts are similar in the each levels. In such cases we, therefore, have to detect the existence of localized perturbation from the abnormal quantum defects in the series or deviated rotational constants in the Rydberg bands. Thus studies on the quantum defect is quite important as an evidence of a localized perturbation. In this work we investigate relation between energy spacing, internuclear distance and quantum defect, by using a typical example of the interaction in the 5pπ^1II^-_u (υ=2) and 7pπ^1II^-_u (υ=1) in H_2. Also we discuss an autoionization effect of perturbed rotational levels in the autoionization area.
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| 2.
論文 |
論文
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Takezawa, S. ; Iida, Y.
概要:
application/pdf<br />Departmental Bulletin Paper<br />Well known R-K-R (Rydberg, Klein, Ree) potential curves of selected states, by using experimentally obtained molecular constants, are constructed for investigations of the
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predissociation and perturbation of H_2. These phenomena are observed in the wave length region, in which the absorption spectrum shows ill-fated appearance and has been not always analyzed completely. Since the region corresponds to the first ionization potential (124 418.2cm^<-1>), we have to take account of autoionization. Closeness of electronic potentials, especially in their left side, as well as narrow energy spacings between interacting energy levels are highly important to understand such phenomena. We construct R-K-R potentials by using previously obtained data and discuss on the perturbation or predissociation which are taking place in the electronic states near the first ionization of H_2. We calculated internuclear distances, r_<max> and r_<min>, namely turning points of potential curves by using our R-K-R computer program.
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| 3.
論文 |
論文
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Takezawa, Sanzo
概要:
application/pdf<br />Departmental Bulletin Paper<br />The absorption bands of H_2, B"-X(4,0), D"-X(2,0) and 7pπ -X(1,0),
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observed around about 803 A, are investigated by using the high resolution spectrum with the reciprocal dispersion 0.6cm-1. This wavelength region is corresponding to the first ionization energy of H_2. Its spectrum are fairly complicate, because of overlapping or masking with many Rydberg bands, of which belong to high members of npσ -X and npπ -X. In this work, the previous line assignments of these bands are examined in detail and are partly modified under the assumption of the perturbation between 7pπ -X(v=1) and 5pπ D"(v=1) bands. The previously observed photoionization peak near the R(0) line of B"-X(4,0) band, 124 354.8cm^<-1> has been 2.7cm^<-1> less to be assigned as the Q(1) line of 7pπ -X(1,0); the J=1 level, 124 473.3cm^<-1>, is below the autoionizing level, 124 476.0cm^<-1> (H_a^+, v=0, J=1). In absorption the R(0) line of B"-X is just superimposed by the Q(1) line of 7pπ -X(1,0) band. This problem is interpreted by consideration of the rotational perturbation. For persuasive interpretation of this localized perturbation, the reliable energy levels and electronic potential curves are essential. The R-K-R potentials require the precise molecular constants for the construction. The rotational and vibrational constants of the three states are evaluated and discussed in this work.
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| 4.
論文 |
論文
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Takezawa, Sanzo
概要:
application/pdf<br />Departmental Bulletin Paper<br />The rotational lines of the 7pπ -X(1,0), 5pπ D"-X(2,0) and 4pσ B"-
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X(4,0) bands are reexamined; all these bands have been observed near its ionization threshhold at 803.7 A. The previously observed photoionization peak near the R(0) line of B"-X(4,0) band, 124 354.8cm^<-1> has been 2.7cm^<-1> less to be assigned as the Q(1) line of 7pπ -X(1,0); the J=1 level, 124 473.3cm^<-1>, is below the autoionizing level, 124 476.0cm^<-1> (H_2^+, v=0, J=1). This problem is interpreted without contradiction in terms of an accidental preionization, namely by interaction with the autoionized levels of D"(v=2). The accidental preionization analogzes to accidental predissociation. Also, it is noticed that the perturbation is preferable to assert the anormalous quantum defects of the Q (1) lines in 7pπ -X(1,0). The present caluculation under the assumption of the perturbation suggests the autoinization rate of the 7pπ state having the similar order to that of the 5pπ D" state.
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