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Submitted on 1 Jan 1979
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MEAN LIVES IN NV
Daniel Dietrich, John Leavitt
To cite this version:
Daniel Dietrich, John Leavitt. MEAN LIVES IN NV. Journal de Physique Colloques, 1979, 40 (C1), pp.C1-169-C1-170. �10.1051/jphyscol:1979132�. �jpa-00218412�
JOURNAL DE PHYSIQUE Colloque C 1, supp/dment au n " 2, Tome 40, fdvrier 1 979, page C 1 - 169
MEAN LIVES IN NV
Daniel D. Dietrich and John A. Leavitt University of Arizona, Tucson, AZ 85721
Abstract. We have measured decay curves for thirty-five transitions in NV yielding mean lives for twenty-seven levels. Analysis techniques used include multiple-exponential least squares fitting to differentiated and undifferentiated decay curves and a multiple linear regression applied to cascade related arbitrarily normalized decay curves (ANDC).
Our results are, in general, in good agreement with theoretical values calculated in the Coulomb approximation.
INTRODUCTION
We report preliminary experimental values of the mean lives of twenty-seven levels in lithium- like NV in the wavelength region from 600 to 5300 1.
Our goal here is to present as complete a set of measurements on a single ionic species as is consis- tent with experimental limitations. The present work contains eleven previously unreported mean lives. Ultimately by comparing the results of different analysis techniques applied to a complete set+of data one might answer some of the questions plaguing mean life measurements in beam foil spec- troscopy. Also, one can test the ability of various model population distributions to reproduce systematic trends in the shapes of the decay curves.
EXPERIMENTAL ARRANGEMENT
A standard side-view beam foil apparatus at the University of Arizona's 6 MV Van de Graaff Laboratory is used to take all of our data. The
spectrometer is a one-meter normal incidence McPhereson 225 (refocused for the beam velocity used) fitted with either a 600 Rlmm :0 1200 Rim grating blazed at 5000 and 1500 8 respectively.
The detectors used to span the region of interest are a Bendix 4219 spiraltron, an EMR 541F and a 1P28.
Among the parameters varied during the experiment were the beam velocity, the beam intensity, the
length of beam viewed, and the spectral resolution.
RESULTS
Our results are compared to theoretical and other experimental results in Fig. 1. The mean lives reported are the result of multi-exponential fittings. The theoretical values are calculated using the Coulomb approximation [9], which should be quite reliable because of the simple electronic configuration of NV. It is clear that, in general, good agreement is obtained.
REFERENCES
Y. Baudinet-Robinet et al., Physica Scripta [ 9 ] E. Biemont and N. Grevesse, Atomic Data and 11, 371 (1975).
- Nuclear Data Tables 2, 217 (1973).
R. Hallin, Arkiv fZjr Fysik.2, 511 (1965). [lo] E. A. Crosbie and J. E. Monahan, Argonne R. L. Kelly and L. J. Palumbo, Atomic and National Laboratory Report ANL-E208 (1959),
Ionic Emission Lines Below 2000 A, Hy Through Argopne, Illinois 60439.
Kr (Naval. Research Laboratory, 1973)'.
- [I11 W. S. Bickel et al., JQSRT 9, 1145 (1969).
H. G. Berry 6t al., JOSA 61, 947 (1971). [I21 L. Barrette et al., Phys. Lett.
E,
435(1970).J. P. Buchet et al., JOSA 62, 623 (1972). J. P. Buchet et al., Nucl. Instr. Meth.
110,
J. P. Buchet and M. C. Buchet-Poulizac, 19 (1973).
JOSA 66, 1011 (1974). [I41 M. Dufay et al., Nucl. Instr. Meth. 90,
J. A. Kernahan et al., Can. J. Phys. 52, 85 (1970).
1895 (1974). [I51 J. ~6ses~uelles, Thesis, Lyon 1 (1970).
L. Heroux, Phys. Rev.
153,
156 (1967).Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1979132
JOURNAL DE PHYSIQUE
MULTl EXPONENTIAL ANALYSIS
Fig. 1. Comparison of experimental results with theoretical and other experimental results. Wavelengths are from Ref. [2] and [3], theory from Ref. [9], and fitting program used from Ref. [lo].
PREVIOUS EXPTL RESULTS
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