日本写真学会誌
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
36 巻, 6 号
選択された号の論文の4件中1~4を表示しています
  • 田中 俊夫
    1973 年 36 巻 6 号 p. 339-345
    発行日: 1973/11/30
    公開日: 2011/08/11
    ジャーナル フリー
    A review is made on the present status of researches on spectral absorptions of silver particles of atomic, molecular and colloidal dispersions. Atomically dispersed silver is stable only in solid matrices and gives color centers such as B-centers in alkali halides. Diatomic silver molecules have been identified spectroscopically in vapor phase, and their properties constitute the basis, of quantum-chemical deductions on existence and properties of polyatomic silver molecules which have not yet been identified experimentally. Extensive studies have been made on color tones of colloidal silver. The absorption peak of colloidal silver in visible region generally shifts toward longer wavelengths and eventually becomes broader with increasing size, deviation from spherical shape, degree of impurity and extent of aggregation of the particles as well as with increasing refractive index of surrounding media. Trials have also been made to study the photolysis of silver salts in terms of spectral absorptions of silver particles produced. Some of these studies including the author's are described briefly.
  • 非線形最適化による分光的色合せ
    大田 登
    1973 年 36 巻 6 号 p. 346-348
    発行日: 1973/11/30
    公開日: 2011/08/11
    ジャーナル フリー
    In the previous paper, the author has established the computer algorithm of spectral color matching in density scale. This method, however, sometimes gives large errors when the degree of spectral color matching is estimated in transmittance scale. Here, the author shows the computer algorithm of spectral color matching in transmittance scale by means of nonlinear optimization technique. Some practical approximations are also demonstrated.
  • アセトフェノンのα 位臭素置換体の合成とその赤外線吸収スペクトル
    五十里 邦弘, 吉田 弘美, 塚田 知道
    1973 年 36 巻 6 号 p. 349-358
    発行日: 1973/11/30
    公開日: 2011/08/11
    ジャーナル フリー
    α, α, α-Tribromoacetophenone derivatives are well synthesized with reference to the method in USP 3, 121, 633 and the literature by Krönke.
    We are very much interested in the spectroscopic shifts occuring with the bromination of acetophenone.
    Some spectroscopic shifts and their explanations are as follow;
    1. 16-20 cm-1 shift of carbonyl stretching frequency to higher wavenumber is observed when α-position of the ketone is substituted by a bromine atom. In this case, no change of proton magnetic resonance shift with the benzene ring proton is observed.
    2. In the solution of mono- and di-bromine substituted ketone, a couple of carbonyl stretching bands and bromine linkage bands are shown. These phenomena are well explained by the existence of two stable rotational isomers at room temperature. More stable and more polar structure of the isomers is discussed.
  • 平田 明, 芳西 哲
    1973 年 36 巻 6 号 p. 359-365
    発行日: 1973/11/30
    公開日: 2011/08/11
    ジャーナル フリー
    Silver halide microcrystals of photographic emulsion have different crystallographic faces, depending upon their preparation conditions. The change in crystal habit affects properties of photosensitive material to considerable extents. Studies in this field was stimulated by using monodisperse emulsion grains having definite crystal shapes. The increased knowledge in the last decade was reviewed.
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