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. 2021 Dec 21;12(1):365–377. doi: 10.1039/d1ra08192f

Frequency-dependent hyperpolarizability β(ω) in form of electro-optic pockel's effect (EOPE) β(−ω;ω,0) in ×10−33 esu, and electric field induced second harmonic generation (EFSHG) with β(2 − ω;ω,ω) in ×10−33 esu at ω = 532 nm and ω = 1064 nm.

Superalkalis ω = 0.0856 au (532 nm) ω = 0.0428 au (1064 nm)
β(−ω;ω,0) β(2ω;ω,0) β(−ω;ω,0) β(2ω;ω,0)
Ge 5 AM 3
Ge5Li3 (A) 3.28 × 10−27 4.42 × 10−27 6.99 × 10−29 1.81 × 10−28
Ge5Na3 (B) 1.29 × 10−27 3.63 × 10−27 2.50 × 10−28 3.72 × 10−28
Ge5K3 (C) 3.54 × 10−26 1.30 × 10−26 2.24 × 10−28 9.50 × 10−28
Ge 9 AM 5
Ge9Li5 (D) 3.02 × 10−29 3.28 × 10−29 7.86 × 10−29 1.47 × 10−30
Ge9Na5 (E) 7.68 × 10−28 4.42 × 10−27 1.56 × 10−26 2.94 × 10−27
Ge9K5 (F) 6.39 × 10−27 1.04 × 10−26 4.93 × 10−29 1.39 × 10−27
Ge 10 AM 3
Ge10Li3 (G) 9.67 × 10−29 1.98 × 10−28 2.24 × 10−29 6.99 × 10−29
Ge10Na3 (H) 5.71 × 10−28 3.71 × 10−28 2.85 × 10−29 5.62 × 10−29
Ge10K3 (I) 1.21 × 10−27 1.04 × 10−27 5.87 × 10−29 2.42 × 10−28