Note: For the most recent values, go to ASD version 3.0.

To see NIST data holdings for energy levels, wavelengths, and transition probabilities select an element:

                               Get Data
H                                                                   He
 
Li  Be                                          B   C   N   O   F   Ne
 
Na  Mg                                          Al  Si  P   S   Cl  Ar
 
K   Ca  Sc  Ti  V   Cr  Mn  Fe  Co  Ni  Cu  Zn  Ga  Ge  As  Se  Br  Kr
 
Rb  Sr  Y   Zr  Nb  Mo  Tc  Ru  Rh  Pd  Ag  Cd  In  Sn  Sb  Te  I   Xe
 
Cs  Ba  La  Hf  Ta  W   Re  Os  Ir  Pt  Au  Hg  Tl  Pb  Bi  Po  At  Rn
 
Fr  Ra  Ac
 

              Ce  Pr  Nd  Pm  Sm  Eu  Gd  Tb  Dy  Ho  Er  Tm  Yb  Lu
 
              Th  Pa  U   Np  Pu  Am  Cm  Bk  Cf  Es  Fm  Md  No  Lr