History of Physics Newsletter

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Block diagram of the decay-time measuring apparatus. a 1-cm light path. Prior to use, the solution in each cell was bubbled with the inert gas nitrogen, then stored and handled in a nitrogen-filled glove box. 99%, was used for bubbling. Further purification was achieved by passing this gas successively through a liquid-nitrogen trap, through a copper cylinder containing copper turnings heated to 600° C, and then through a second liquid-nitrogen trap. 52·99·100 This apparatus combines the best features of several instru­ ments.

14 FIGURE 10. Histogram of the flash from a hydrogen lamp (Curve I) and of a sample solution («NPO in cyclohexane) introduced into the path of the flash (Curve II). is registered in its assigned channel. Data from many traces are summed and stored in the memory circuit for subsequent recording in semilog form on an X-Y recorder. The pulse contour of the hydrogen flash without the sample solution in place is as shown by Curve I in Fig. 10. When the sample solution is in place, the recorded pulse is different from the above contour in two ways: (1) it is shifted in position, and (2) the pulse shape is modified according to the value of the decay time of the solution.

Moreover, they were unable to determine, within an uncertainty of ^ 5 cm -1 , a solvent frequency shift. 4 Concentration Effects The fluorescence spectrum occasionally develops a long-wavelength com­ ponent at high solute concentrations, whereas the shape of the absorption spectrum remains unaltered. 3b). Whether the quantum yield of a solution will change with solute concentration will depend on the magnitude of the quantum yield of the excimer.

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