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|  | Ref. ID |  |  |  | Reference |  | 
|---|
 |  |  
|  |  |  |  |  |  |  |  | DR72a | S. P. Davis and J. Reader, unpublished material (1972). See [DR72b]. |  |  |  |  | DR72b | S. P. Davis and J. Reader, J. Opt. Soc. Am. B 62, 1370A (1972). |  |  |  |  | MSB51 | W. F. Meggers, B. F. Scribner, and W. R. Bozman, J. Res. Natl. Bur. Stand. (U.S.) 46, 85 (1951). |  |  |  |  | MZH78 | W. C. Martin, R. Zalubas, and L. Hagan, Atomic Energy Levels - The Rare Earth Elements, Natl. Stand. Ref. Data Ser., Natl. Bur. Stand. (U.S.) 60 (1978). |  |  |  |  | OHRW95 | R. Otto, H. Hühnermann, J. Reader, and J.-F. Wyart, J. Phys. B 28, 3615 (1995). Tables 1 and 4 of this reference comprise the most extensive published data on energy-level classifications for Pm II lines.  The wavelengths in Table 1 were apparently derived from the levels by using an inaccurate formula for the dispersion of air; the resulting values are longer than the more accurate values in [RCWM80] by 0.02 to 0.05 Å. |  |  |  |  | RCWM80 | J. Reader, C. H. Corliss, W. L. Wiese, and G. A. Martin, Natl. Stand. Ref. Data Ser., Natl. Bur. Stand. (U.S.) 68 (1980). The Pm II wavelengths in this reference were taken from [MSB51] and [DR72a].  The energy-level classifications for the Pm II persistent lines given here are from [DR72a] and [OHRW95]. |  |  |  |  | RD67 | J. Reader and S. P. Davis, J. Res. Natl. Bur. Stand. (U.S.) 71A, 587 (1967) and unpublished material. |  |  |  |  | SR65 | J. Sugar and J. Reader, J. Opt. Soc. Am. B 55, 1286 (1965). |  |  |  |  | WSPC78 | E. F. Worden, R. W. Solarz, J. A. Paisner, and J. G. Conway, J. Opt. Soc. Am. B 68, 52 (1978). |  |  |  |  |