Table 5: Calculated vibrational energy levels (in cm−1) and comparison with available experimental results for HSi81Br ().

This work Expt. [8] This work Expt. [8] 0.0 3471.2 415.1 415.23 3489.5 541.8 535.31 3542.3 826.1 3579.7 955.2 947.95 3613.0 1081.0 1059.20 3631.6 1233.5 3709.4 3639.63 1364.4 3718.9 1491.4 1469.44 3732.2 1612.8 1569.07 3765.7 3675.25 1637.4 3801.9 1770.3 3839.6 1813.7 1786.96 3839.8 3783.65 1897.4 3840.8 2019.6 1976.42 3870.7 2037.1 3874.9 2126.4 2060.57 3894.4 3828.00 2173.0 3942.1 2226.4 2199.43 3951.7 2300.7 4001.8 2321.2 2286.15 4032.3 2421.8 4075.0 2431.5 4105.7 2529.9 4110.7 2571.2 4164.2 2613.8 2526.79 4192.3 4068.67 2635.0 4232.6 2701.4 4245.0 2732.1 2696.27 4254.1 2819.5 2770.59 4298.5 4228.03 2819.8 4318.7 2822.1 4337.6 4261.15 2928.6 4339.3 2964.1 4357.6 3014.0 4384.6 3040.1 4429.7 3065.0 4475.9 3098.1 4479.5 3139.0 4506.4 3202.6 4620.7 3219.2 4631.5 3227.8 3177.99 4645.6 3305.2 3235.83 4681.2 3324.8 4698.3 4620.59 3351.1 4728.2 4643.80 3409.3 4733.0 3432.9 4761.0 4679.78 3441.8 4765.2 3447.7 4797.7