The Effect of Monochromatic Light on the Concentration of Large Ions

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Elnadi, A. F. ; Farag, N. (2011)

The divided electrode condenser is used to study the effect of monochromatic light of wave lengths between 4,030 and 6,610 Å (using 10 interference filters of Jena glass), on the concentration of large ions having mobilities below 10 × 10−4 cm/sec: volt/cm. The number of ions per c.c. is measured with the aid of the characteristics obtained for each wave length, at different group mobilities, both in the presence of light (N1) and in complete darkness (N2). The ratio (N1/N2) is obtained for each filter and for the four mobility groups, i.e. 6.90 × 10−4, 2.22 × 10−4, 1.02 × 10−4 and 0.60 × 10−4 cm/sec.: volt/cm. The results are discussed on the basis of statistical analysis by applying the correlation and significance tests.DOI: 10.1111/j.2153-3490.1960.tb01317.x
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    4,030A and those obtained with 6,610A, were 2. There is a slight decrease in the ion connot significant, while the ratios obtained with centration in the presence of monochromatic 5,280 A and those obtained with 6,610A were light in case of the roup mobilities k, and k,.

    almost insignificant. This decrease is cKear in the range 4,030- 5,840A and is less clear in the range 6,010- 6,610A.

    light in case of the grou mobilities k, and kz. 3 . In general the increase in the ion conThis increase is more cPear within the range centration in case of the groups k, and k, is 4,030-5,670A (i.e. from violet to green),and small, and also the decrease in the ion concenit decreases gradually from 5,670 to 6,610A tration in case of the groups k, and k, is very (i.e. from green to red). small, as the transmitted light from the interThis increase in the ion concentration may ference filters was I57 %.

    be explained as due to an increase in the 4. The ratios (Nl/N2)obtained in case of number of nuclei formed from the constituents positive ions were approximately the same as of air ( d y oxygen and nitrogen) as a those obtained in case of negative ions but result of photo effect. sometimes they are slightly higher.

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