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本文以氮分子激光器为激发光源,研究了激发态铀酰离子在高氯酸溶液中的发光衰减和时间分辨发光光谱.铀酰离子的发光衰减与铀浓度以及溶液的pH有关,当铀浓度c_u<10~(-3)mol·dm~(-3)时,溶液pH为1.5～4.0范围内,发光呈单一指数衰减;当c_u≥10~(-3)mol·dm~(-3)时,发现发光呈双指数衰减,即除了上述发光组份外,还观察到另一发光寿命较长的组份.用时间分辨方法测得的铀酰溶液的发光光谱表明,上述现象与激发态水合铀酰离子及其水解产物形成的发光体有关.
In this paper, the luminescent decay and time-resolved luminescence spectra of excited uranyl ion in perchloric acid solution were studied by using nitrogen laser as excitation light source.The luminescence decay of uranyl ion was related to the uranium concentration and the pH of the solution. When the uranium concentration c_u When the pH value is in the range of 1.5-4.0, the luminescence shows a single exponential decay when <10 -3 mol · dm -3. When c_u ≥10 ~ (-3) mol · dm -3 , It was found that the luminescence showed a double exponential decay, that is, in addition to the above light-emitting components, another component with a longer luminescence lifetime was observed.The luminescence spectra of the uranyl solution measured by the time-resolved method showed that the above phenomenon was in agreement with the excited state hydration Uranyl ions and their hydrolysates formed by the luminous body.