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	hartrees
Energy at 0K	-759.998107
Energy at 298.15K	-760.001837
HF Energy	-759.045625
Nuclear repulsion energy	284.820144

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)
1	A'	3611	3464
2	A'	1314	1260
3	A'	1173	1126
4	A'	963	923
5	A'	685	657
6	A'	519	498
7	A'	494	473
8	A'	363	348
9	A"	1177	1129
10	A"	526	504
11	A"	375	360
12	A"	166	159

Atom	x (Å)	y (Å)	z (Å)
Cl1	-0.148	0.010	0.000
O2	-0.488	1.427	0.000
O3	1.550	0.094	0.000
O4	-0.488	-0.718	1.227
O5	-0.488	-0.718	-1.227
H6	1.843	-0.848	0.000

	Cl1	O2	O3	O4	O5	H6
Cl1		1.4567	1.7000	1.4675	1.4675	2.1685
O2	1.4567		2.4354	2.4716	2.4716	3.2576
O3	1.7000	2.4354		2.5141	2.5141	0.9867
O4	1.4675	2.4716	2.5141		2.4548	2.6381
O5	1.4675	2.4716	2.5141	2.4548		2.6381
H6	2.1685	3.2576	0.9867	2.6381	2.6381

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
Cl1	O3	H6	104.480	O2	Cl1	O3	100.697
O2	Cl1	O4	115.389	O2	Cl1	O5	115.389
O3	Cl1	O4	104.833	O3	Cl1	O5	104.833
O4	Cl1	O5	113.520

All results from a given calculation for HClO₄ (perchloric acid)

using model chemistry: QCISD(T)/6-31G*

States and conformations

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for HClO4 (perchloric acid)

using model chemistry: QCISD(T)/6-31G*

States and conformations

All results from a given calculation for HClO₄ (perchloric acid)