Clover Leaves' Delayed Luminescence Characteristic under Excitation of Alternating Electric Field

With clover leaves as experimental material,their delayed luminescence characteristic under excitation of alternating electric field was measured using BPCL type Weak-luminescence Measuring Instrument, and the decay law of Delayed Luminescence Intensity with time and the change of Initial Light Intensity with the frequency, peak voltage and excitation time of alternating electric field were observed. It was found that: Under the three kinds of excitation, the leaves' Delayed Luminescence all presented an exponential decay law with the time. In the frequency ranging from 100H
_Z
to 30000H
_Z
, the Initial Light Intensity showed a trend of first increasing and then decreasing with the frequency increasing; In the excitation time ranging from 5 min to 30 min, the Initial Light Intensity showed a trend of first increasing and then decreasing with the excitation time increasing; In the peak voltage ranging from 500 v to 10000 v, the Initial Light Intensity showed a trend of first decreasing and then increasing with the peak voltage increasing. The reason is mainly due to that the frequency, the peak voltage and excitation time of alternating electric field have an effect on the electrons transition in non-bonding oxygen atom which locates on chlorophyll's carbonyl.