Table 5 Table shows bands, subgroups and eigenvectors of M₂B₂H₄ (M = Sc, Y, V, Nb), where the direction of vibration referred as out-of-plane (OP) or in-plane (IP)

Band ν	Subgroup	Eigenvec.	Sc₂B₂H₄	Band ν	Subgroup	Eigenvec.	Y₂B₂H₄
4,5	E_1g	Sc:IP	20.40	4,5	E_1g	Y:IP	13.23
6	A_1g	Sc:OP	28.17	6	A_1g	Y:OP	18.93
7	B_2u	H:OP	44.26	7,8	E_1u	B:IP	37.49
8	B_1g	H:OP	44.37	9	B_2u	H:OP	40.21
9,10	E_1u	B:IP	44.57	10	B_1g	H:OP	42.47
11	A_2u	B:OP	52.40	11	A_2u	B:OP	46.30
12	B_1g	B:OP	81.51	12,13	E_2g	B:IP	65.96
13,14	E_2g	B:IP	90.36	14	B_1g	B:OP	75.81
15	A_2u	H:OP	103.56	15	A_2u	H:OP	99.14
16	A_1g	H:OP	104.06	16	A_1g	H:OP	99.45
17,18	E_1u	H:IP	138.94	17,18	E_1u	H:IP	137.79
19,20	E_1g	H:IP	139.26	19,20	E_1g	H:IP	138.11
21,22	E_2u	H:IP	159.29	21,22	E_2u	H:IP	159.66
23,24	E_2g	H:IP	159.44	23,24	E_2g	H:IP	159.90
Band ν	Subgroup	Eigenvec.	V₂B₂H₄	Band ν	Subgroup	Eigenvec.	Nb₂B₂H₄
4,5	E_1g	V:IP	23.34	4,5	E_1g	Nb:IP	12.60
6	A_1g	V:OP	27.97	6	A_1g	Nb:OP	21.01
7,8	E_1u	H:IP	30.95	7,8	E_1u	H:IP	32.17
9,10	E_1g	H:IP	48.84	9,10	E_1g	H:IP	61.69
11,12	E_1u	B:IP	64.94	11,12	E_1u	H:IP	66.40
13	A_2u	B:OP	65.94	13	A_2u	B:OP	68.40
14	B_1g	B:OP	71.01	14	B_1g	B:OP	69.61
15,16	E_2g	H:IP	80.18	15	B_2u	H:OP	76.24
17,18	E_2u	H:IP	88.50	16	B_1g	H:OP	90.20
19	B_2u	H:OP	102.44	17,18	E_2g	B:IP	95.48
20	A_1g	H:OP	106.17	19,20	E_2g	H:IP	102.73
21	B_1g	H:OP	107.11	21	A_1g	H:OP	111.72
22	A_2u	H:OP	111.05	22	A_2u	H:OP	117.11
23,24	E_2g	B:IP	122.03	23,24	E_2u	H:IP	121.43

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