Sajeev, Y.; Sindelka, M.; Moiseyev, N. (2008). “Hund’s multiplicity rule: From atoms to quantum dots”. J. Chem. Phys.128 (6): 061101. doi:10.1063/1.2837456.
Davidson, Ernest R. (1965). “Single‐Configuration Calculations on Excited States of Helium. II”. J. Chem. Phys.42 (12): 4199–4200. doi:10.1063/1.1695919.
Hongo, Kenta; Maezono, Ryo; Kawazoe, Yoshiyuki; Yasuhara, Hiroshi; Towler, M. D.; Needs, R. J. (2004). “Interpretation of Hund’s multiplicity rule for the carbon atom”. J. Chem. Phys.121 (15): 7144–7147. doi:10.1063/1.1795151. ISSN0021-9606.
Sako, Tokuei; Paldus, Josef; Ichimura, Atsushi; Diercksen, Geerd H. F. (2011). “Origin of Hund’s multiplicity rule in singly excited helium: Existence of a conjugate Fermi hole in the lower spin state”. Phys. Rev. A83 (3): 032511. doi:10.1103/PhysRevA.83.032511.
NIST Atomic Spectrum Database To read the manganese atom levels, type "Mn I" in the Spectrum box and click on Retrieve data.
NIST Atomic Spectrum Database To read the chromium atom levels, type "Cr I" in the Spectrum box and click on Retrieve data.
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Hongo, Kenta; Maezono, Ryo; Kawazoe, Yoshiyuki; Yasuhara, Hiroshi; Towler, M. D.; Needs, R. J. (2004). “Interpretation of Hund’s multiplicity rule for the carbon atom”. J. Chem. Phys.121 (15): 7144–7147. doi:10.1063/1.1795151. ISSN0021-9606.