Zeeman Splitting between Nondegenerate Crystalline Stark Levels of ${Tm}^{3}$ ( $4 f^{12}$ ) in Monoclinic Single Crystals

Optical Zeeman absorption and electron-paramagnetic-resonance experiments reveal that the ground crystalline Stark levels of

{Tm}^{3 +}

in Y

{Cl}_{3}

·6

H_{2}

O and Tm

{Cl}_{3}

·6

H_{2}

O and

{Tm}^{3 +}

Y_{2}

{(S O_{4})}_{3}

·8

H_{2}

O and

{Tm}_{2}

{(S O_{4})}_{3}

·8

H_{2}

O are nearly accidentally degenerate. Extrapolation of the data to zero magnetic field gives the lowest Stark levels of the

{}^{3}H_{6}

state of

{Tm}^{3 +}

as 0 and 1.12

{cm}^{- 1}

for the chloride salts; 0 and 0.61

{cm}^{- 1}

for the sulfate salts. It is also found from the EPR data that the sulfate has two magnetically inequivalent lattice sites.

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Zeeman Splitting between Nondegenerate Crystalline Stark Levels ofTm3(4f12) in Monoclinic Single Crystals