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	hartrees
Energy at 0K	-755.587890
Energy at 298.15K
HF Energy	-755.016594
Nuclear repulsion energy	259.899715

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A'	3315	3164	8.95
2	A'	1096	1046	105.38
3	A'	952	909	90.34
4	A'	819	782	75.40
5	A'	523	499	212.69
6	A'	407	388	23.00
7	A'	354	338	0.14
8	A'	248	237	6.86
9	A"	960	917	129.27
10	A"	413	394	35.35
11	A"	274	261	23.75
12	A"	215i	205i	81.71

Atom	x (Å)	y (Å)	z (Å)
Cl1	-0.175	0.009	0.000
O2	-0.533	1.563	0.000
O3	1.722	0.097	0.000
O4	-0.533	-0.784	1.343
O5	-0.533	-0.784	-1.343
H6	1.994	-0.879	0.000

	Cl1	O2	O3	O4	O5	H6
Cl1		1.5943	1.8984	1.6002	1.6002	2.3440
O2	1.5943		2.6895	2.7038	2.7038	3.5146
O3	1.8984	2.6895		2.7683	2.7683	1.0134
O4	1.6002	2.7038	2.7683		2.6853	2.8637
O5	1.6002	2.7038	2.7683	2.6853		2.8637
H6	2.3440	3.5146	1.0134	2.8637	2.8637

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
Cl1	O3	H6	102.967	O2	Cl1	O3	100.351
O2	Cl1	O4	115.639	O2	Cl1	O5	115.639
O3	Cl1	O4	104.282	O3	Cl1	O5	104.282
O4	Cl1	O5	114.079

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

using model chemistry: MP2/3-21G

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: MP2/3-21G

States and conformations

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