Low-temperature thermoluminescent behavior of 5'dCMP single crystals
Thermoluminescence (TL) and emission spectra studies of x-irradiated single crystals of deoxycytidine-5'-phosphate monohydrate (5' dCMP) were conducted in the interval 10--300 K. Two intense glow peaks were observed at 42 and 74 K with additional weaker peaks at 112, 140, and 200 K. By applying the Randall--Wilkins theory of glow curves to our data we obtained thermal activation energies (E) and frequency factors (s) characterizing each of the glow peaks, except the one at 200 K: it was of insufficient intensity. The parameters are: 42 K (E = 0.032 +- 0.009 eV, s = 316 s/sup -1/); 74 K (E = 0.095 +- 0.035 eV, s = 10/sup 5/ s/sup -1/); 112 K (E = 0.080 +- 0.02 eV, s = 20 s/sup -1/); and 140 K (E = 0.12 +- 0.04 eV, s = 56 s/sup -1/). As a check on the validity of the Randall--Wilkins theory we generated theoretical glow curves using the experimental parameters of the 42 K peak. Excellent agreement between the two glow curves was found. Typical spectral emission from each glow peak consists of band emission exhibiting maxima at 428 and 463 nm. We attribute these peaks to radiative electronic transitions from the first excited singlet and triplet states to the ground state (S/sub 1/..-->..S/sub 0/+h..nu.. and T/sub 1/..-->..S/sub 0/+h..nu..). Based upon our experimental results we present an energy-level diagram depicting the TL process in single crystal 5'dCMP in the interval 10--300 K. Finally, we discuss possible correlations between the appearance of TL glow peaks and the thermal decay of radiation-induced radicals as observed by ESR and ENDOR.
- Research Organization:
- Department of Physics, Memphis State University, Memphis, Tennessee 38152
- OSTI ID:
- 5808245
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 76:5
- Country of Publication:
- United States
- Language:
- English
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DEOXYCYTIDINE
EMISSION SPECTRA
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LOW TEMPERATURE
MEDIUM TEMPERATURE
MONOCRYSTALS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
X RADIATION
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CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
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IONIZING RADIATIONS
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NUCLEOSIDES
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RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RIBOSIDES
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400600* - Radiation Chemistry