The exploration of deep-ultraviolet (DUV) nonlinear optical materials remains challenging. Herein, we report three novel compounds, NaK 3 Rb 2 (CO 3 )(HCO 3 ) 2 ·2H 2 O (I), NaK 3.6 Rb 1.4 (CO 3 )(HCO 3 ) 2 ·2H 2 O (II), and NaK 5 (CO 3 )(HCO 3 ) 2 (III), all exhibiting cutoff edges below 200 nm....
Iqbal et al. (Thu,) studied this question.