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Release 18October 2016
NIST Standard Reference Database 101
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IV.A.4. (XIV.F.)

Relative enthalpies of isomers - Comparison of 0K enthalpies (kJ mol-1)

Isomers of C5H10

2015 06 30 15:39
index Species CAS number Name Relative experimental enthalpy (kJ mol-1) sketch
a CH2CHCH2CH2CH3 109671 1-pentene   sketch of 1-pentene
b C5H10 287923 Cyclopentane 0.0 sketch of Cyclopentane
c C5H10 513359 2-Butene, 2-methyl- 31.1 sketch of 2-Butene, 2-methyl-
d C5H10 563462 1-Butene, 2-methyl- 36.3 sketch of 1-Butene, 2-methyl-
e C5H10 627203 2-Pentene, (Z)- 45.8 sketch of 2-Pentene, (Z)-
f C5H10 646048 2-Pentene, (E)- 39.9 sketch of 2-Pentene, (E)-
g C5H10 1630940 Cyclopropane, 1,1-dimethyl- 65.3 sketch of Cyclopropane, 1,1-dimethyl-
The calculated enthalpies include the calculated and scaled vibrational zero-point energy.
Methods with predefined basis sets
composite G1 NC
NC
NC
G2MP2 NC
NC
NC
G2 NC
NC
NC
G3 39.6 a
0.0 b
16.3 c
24.7 d
34.5 e
30.1 f
54.0 g
G3B3 NC
NC
NC
NC
NC
NC
G3MP2 37.1 a
0.0 b
14.9 c
23.1 d
32.6 e
28.4 f
54.6 g
CBS-Q 41.4 a
0.0 b
14.6 c
27.3 d
34.2 e
29.7 f
53.7 g

Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
hartree fock HF 177.3 a
0.0 b
153.7 c
164.1 d
168.4 e
165.4 f
148.8 g
59.0 a
0.0 b
46.5 c
50.3 d
56.9 e
54.2 f
103.5 g
59.0 a
0.0 b
46.5 c
50.3 d
56.9 e
54.2 f
103.5 g
41.2 a
0.0 b
22.1 c
30.1 d
34.9 e
31.6 f
81.0 g
50.9 a
0.0 b
33.9 c
40.9 d
45.3 e
41.7 f
72.0 g
48.8 a
0.0 b
31.6 c
38.8 d
43.3 e
39.5 f
69.5 g
41.5 a
0.0 b
26.8 c
31.8 d
36.9 e
33.7 f
66.6 g
44.8 a
0.0 b
29.7 c
35.5 d
40.0 e
36.3 f
71.9 g
40.9 a
0.0 b
25.6 c
31.1 d
36.3 e
32.5 f
67.2 g
46.3 a
0.0 b
28.5 c
35.5 d
40.8 e
36.6 f
67.7 g
34.0 a
0.0 b
21.1 c
26.3 d
31.9 e
28.2 f
63.9 g
37.0 a
0.0 b
25.4 c
30.0 d
35.1 e
31.8 f
68.8 g
42.8 a
0.0 b
26.3 c
33.0 d
37.7 e
33.4 f
68.3 g
37.2 a
0.0 b
21.4 c
27.0 d
32.1 e
28.3 f
64.9 g
40.7 a
0.0 b
29.0 c
33.7 d
39.3 e
35.2 f
70.6 g

0.0 b
20.4 c
25.9 d
31.0 e
27.3 f
64.6 g
34.6 a
0.0 b
21.4 c
27.0 d
32.1 e
28.3 f
64.9 g
density functional LSDA 174.1 a
0.0 b
139.6 c
156.7 d
159.9 e
157.7 f
136.1 g
99.4 a
0.0 b
72.6 c
85.6 d
92.9 e
88.2 f
107.0 g
99.4 a
0.0 b
72.6 c
85.6 d
92.9 e
88.2 f
107.0 g
81.7 a
0.0 b
46.2 c
63.4 d
69.9 e
64.2 f
81.2 g
90.2 a
0.0 b
54.6 c
71.5 d
78.4 e
72.6 f
71.6 g
NC
NC
NC
NC
NC
NC
83.5 a
0.0 b
50.5 c
65.7 d
72.5 e
67.2 f
66.9 g
85.7 a
0.0 b
54.7 c
69.4 d
75.8 e
70.1 f
73.5 g
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
    88.5 a
0.0 b
55.1 c
71.4 d
77.4 e
71.5 f
73.0 g
79.5 a
0.0 b
46.2 c
61.7 d
68.5 e
62.7 f
65.7 g
87.7 a
0.0 b
54.7 c
69.2 d
77.1 e
71.1 f
69.7 g
  80.0 a
0.0 b
46.2 c
61.7 d
68.5 e
62.7 f
65.7 g
SVWN   103.2 a
0.0 b
72.6 c
85.6 d
93.0 e
88.3 f
107.0 g
    91.4 a
0.0 b
54.9 c
71.8 d
78.7 e
72.9 f
71.9 g
  84.0 a
0.0 b
51.0 c
66.1 d
73.0 e
67.6 f
67.4 g
        80.1 a
0.0 b
47.8 c
62.4 d
69.1 e
63.7 f
67.5 g
         
BLYP 124.6 a
0.0 b
97.7 c
110.7 d
113.0 e
111.6 f
124.4 g
50.3 a
0.0 b
30.5 c
39.7 d
43.6 e
41.2 f
95.5 g
50.3 a
0.0 b
30.4 c
39.7 d
43.6 e
41.2 f
95.5 g
29.7 a
0.0 b
3.1 c
15.9 d
19.4 e
16.1 f
69.3 g
35.6 a
0.0 b
10.0 c
22.8 d
26.6 e
23.1 f
60.8 g
36.1 a
0.0 b
9.8 c
22.6 d
26.0 e
22.3 f
60.4 g
29.3 a
0.0 b
5.5 c
16.4 d
19.8 e
16.7 f
56.2 g
31.7 a
0.0 b
8.3 c
19.7 d
22.2 e
18.9 f
62.1 g
28.2 a
0.0 b
5.0 c
16.2 d
19.0 e
15.8 f
57.9 g
34.5 a
0.0 b
7.5 c
20.0 d
24.3 e
20.6 f
57.1 g
    35.4 a
0.0 b
11.9 c
23.5 d
26.4 e
22.5 f
62.7 g
24.2 a
0.0 b
0.4 c
11.7 d
14.5 e
11.3 f
54.5 g

0.0 b
11.9 c
21.9 d
26.1 e
22.4 f
59.9 g
  22.1 a
0.0 b
0.4 c
11.7 d
14.5 e
11.3 f
54.5 g
B1B95 150.3 a
0.0 b
124.8 c
138.7 d
141.1 e
139.0 f
125.8 g
80.2 a
0.0 b
59.2 c
67.6 d
73.7 e
70.1 f
98.4 g
80.2 a
0.0 b
59.2 c
67.6 d
73.7 e
70.1 f
98.4 g
62.5 a
0.0 b
31.2 c
44.2 d
48.5 e
45.0 f
72.5 g
67.7 a
0.0 b
40.4 c
53.2 d
57.6 e
53.8 f
62.5 g
102.2 a
0.0 b
37.1 c
50.0 d
54.2 e
50.3 f
60.1 g
60.9 a
0.0 b
33.8 c
45.3 d
49.6 e
46.1 f
57.0 g
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
64.7 a
0.0 b
35.6 c
48.5 d
53.6 e
49.4 f
58.1 g
    63.5 a
0.0 b
36.8 c
49.3 d
53.0 e
48.9 f
61.4 g
59.0 a
0.0 b
33.0 c
44.4 d
49.1 e
45.0 f
57.7 g

NC
NC
NC
NC
NC
NC
NC

0.0 b
33.0 c
44.4 d
49.1 e
45.0 f
57.7 g
B3LYP 143.3 a
0.0 b
116.2 c
129.2 d
132.1 e
130.1 f
132.0 g
61.4 a
0.0 b
42.4 c
50.8 d
55.8 e
53.0 f
99.9 g
61.4 a
0.0 b
42.4 c
50.8 d
55.8 e
53.0 f
99.9 g
41.8 a
0.0 b
15.8 c
28.0 d
32.2 e
28.5 f
74.5 g
49.4 a
0.0 b
23.4 c
35.5 d
39.8 e
36.0 f
65.4 g
48.3 a
0.0 b
22.9 c
34.9 d
39.0 e
35.0 f
64.6 g
41.8 a
0.0 b
18.8 c
29.0 d
33.1 e
29.8 f
61.0 g
43.7 a
0.0 b
21.0 c
31.7 d
35.1 e
31.4 f
66.3 g
40.1 a
0.0 b
17.4 c
27.8 d
31.7 e
28.1 f
61.9 g
46.7 a
0.0 b
20.4 c
32.3 d
37.2 e
33.2 f
62.0 g

0.0 b
12.6 c
22.8 d
27.1 e
23.6 f
57.5 g
35.5 a
0.0 b
15.3 c
25.2 d
28.9 e
25.6 f
61.6 g
46.9 a
0.0 b
23.6 c
34.7 d
38.4 e
34.2 f
66.5 g
36.2 a
0.0 b
12.7 c
23.5 d
27.3 e
23.6 f
58.6 g
NC
NC
NC
NC
NC
NC
33.5 a
0.0 b
12.3 c
22.8 d
26.7 e
23.2 f
58.3 g
34.2 a
0.0 b
12.7 c
23.5 d
27.3 e
23.6 f
58.6 g
B3LYPultrafine         49.5 a
0.0 b
23.4 c
35.5 d
39.8 e
36.0 f
65.5 g
               
NC
NC
NC
  33.5 a
0.0 b
12.3 c
22.8 d
26.8 e
23.3 f
58.4 g
 
B3PW91 155.2 a
0.0 b
127.0 c
140.8 d
143.2 e
141.1 f
132.9 g
79.1 a
0.0 b
59.5 c
68.3 d
73.5 e
70.3 f
103.5 g
79.1 a
0.0 b
59.6 c
68.4 d
73.5 e
70.4 f
103.5 g
58.5 a
0.0 b
31.5 c
44.6 d
48.3 e
44.5 f
77.4 g
NC
NC
NC
NC
NC
NC
64.8 a
0.0 b
38.1 c
51.2 d
54.7 e
50.6 f
66.2 g
59.7 a
0.0 b
35.2 c
46.6 d
50.3 e
46.8 f
63.4 g
61.6 a
0.0 b
37.5 c
49.1 d
52.4 e
48.4 f
68.6 g
57.6 a
0.0 b
33.2 c
44.8 d
48.4 e
44.6 f
63.7 g
63.4 a
0.0 b
35.8 c
48.9 d
53.1 e
48.9 f
64.1 g
    63.1 a
0.0 b
37.9 c
50.4 d
53.5 e
49.3 f
67.6 g
NC
NC
NC
NC
NC
NC

0.0 b
38.3 c
49.4 d
53.9 e
49.5 f
66.4 g
  NC
NC
NC
NC
NC
NC
mPW1PW91 161.0 a
0.0 b
133.8 c
147.5 d
150.4 e
148.1 f
135.6 g
79.8 a
0.0 b
65.5 c
73.8 d
79.7 e
76.5 f
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
66.9 a
0.0 b
45.1 c
57.7 d
61.9 e
57.9 f
65.5 a
0.0 b
43.9 c
56.5 d
60.6 e
56.4 f
60.0 a
0.0 b
40.6 c
51.5 d
55.7 e
52.1 f
65.0 g
62.2 a
0.0 b
43.1 c
54.3 d
58.2 e
54.1 f
70.5 g
62.8 a
0.0 b
38.5 c
49.8 d
54.1 e
50.1 f
65.4 g
68.5 a
0.0 b
41.2 c
54.0 d
58.8 e
54.4 f
66.0 g
    63.3 a
0.0 b
43.0 c
55.3 d
59.0 e
54.6 f
69.3 g
60.5 a
0.0 b
39.6 c
46.9 d
51.0 e
46.9 f
63.5 g

0.0 b
43.4 c
54.2 d
59.2 e
54.8 f
68.3 g
  58.9 a
0.0 b
39.6 c
46.9 d
51.0 e
46.9 f
63.5 g
M06-2X     62.4 a
0.0 b
38.4 c
47.8 d
  62.3 a
0.0 b
38.3 c
47.7 d
56.8 e
51.1 f
57.5 g
                       
PBEPBE 145.3 a
0.0 b
115.7 c
130.3 d
132.8 e
130.9 f
126.7 g
NC
NC
NC
NC
NC
NC
77.1 a
0.0 b
55.8 c
65.7 d
71.0 e
67.9 f
100.9 g
54.7 a
0.0 b
25.8 c
39.9 d
43.9 e
40.1 f
73.3 g
62.5 a
0.0 b
33.2 c
47.4 d
51.5 e
47.5 f
63.6 g
61.2 a
0.0 b
32.3 c
46.6 d
50.4 e
46.3 f
62.6 g
55.5 a
0.0 b
29.1 c
41.5 d
45.5 e
41.9 f
59.0 g
58.3 a
0.0 b
32.4 c
45.1 d
48.5 e
44.6 f
65.0 g
54.7 a
0.0 b
28.5 c
41.2 d
45.0 e
41.1 f
60.5 g
NC
NC
NC
NC
NC
NC

0.0 b
24.6 c
37.3 d
41.5 e
37.7 f
56.4 g
  60.3 a
0.0 b
33.4 c
47.0 d
50.3 e
46.0 f
64.6 g
NC
NC
NC
NC
NC
NC

0.0 b
33.6 c
45.6 d
46.0 f
62.4 g
  NC
NC
NC
NC
NC
NC
PBEPBEultrafine        
0.0 b
33.5 c
47.6 d
51.7 e
47.8 f
63.9 g
                       
PBE1PBE         74.4 a
0.0 b
48.1 c
60.9 d
65.4 e
61.2 f
69.7 g
                       
HSEh1PBE   84.5 a
0.0 b
64.7 c
73.4 d
79.6 e
76.2 f
104.4 g
    72.1 a
0.0 b
44.9 c
57.8 d
62.4 e
58.2 f
68.2 g
  63.5 a
0.0 b
40.1 c
51.3 d
55.9 e
52.2 f
63.4 g
            60.3 a
0.0 b
34.3 c
46.2 d
50.8 e
46.6 f
61.3 g
     
TPSSh         60.5 a
0.0 b
35.7 c
47.9 d
51.7 e
48.2 f
63.3 g
  52.9 a
0.0 b
31.4 c
42.0 d
45.7 e
42.5 f
58.9 g
    57.7 a
0.0 b
32.2 c
44.6 d
48.9 e
45.0 f
60.0 g
      49.5 a
0.0 b
26.5 c
38.1 d
41.6 e
38.0 f
57.9 g
     
wB97X-D     79.2 a
0.0 b
63.8 c
69.4 d
76.9 e
74.2 f
103.5 g
  67.8 a
0.0 b
45.0 c
54.9 d
62.3 e
57.6 f
70.2 g
  NC
NC
NC
NC
NC
NC
  58.3 a
0.0 b
37.6 c
46.4 d
53.5 e
48.8 f
65.8 g
    66.4 a
0.0 b
49.7 c
55.2 d
61.1 e
57.6 f
75.4 g
NC
NC
NC
NC
NC
NC
56.0 a
0.0 b
34.0 c
43.6 d
50.7 e
45.6 f
63.6 g
  55.2 a
0.0 b
33.8 c
43.3 d
50.5 e
45.5 f
63.5 g
 
B97D3   58.2 a
0.0 b
39.8 c
46.9 d
54.0 e
51.6 f
98.6 g
    45.5 a
0.0 b
19.2 c
30.6 d
37.1 e
33.3 f
60.6 g
      38.0 a
0.0 b
14.4 c
24.5 d
30.6 e
27.1 f
57.8 g
            33.4 a
0.0 b
9.2 c
19.5 d
25.6 e
22.1 f
53.8 g
 
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2 130.1 a
0.0 b
105.1 c
115.6 d
121.0 e
119.0 f
136.3 g
56.0 a
0.0 b
39.0 c
43.8 d
54.4 e
51.8 f
95.6 g
56.0 a
0.0 b
39.0 c
43.8 d
54.4 e
51.8 f
95.6 g
39.8 a
0.0 b
15.5 c
24.2 d
34.3 e
30.7 f
70.8 g
64.6 a
0.0 b
42.0 c
50.6 d
59.4 e
55.6 f
63.2 g
64.7 a
0.0 b
42.8 c
50.9 d
59.9 e
56.1 f
63.4 g
56.7 a
0.0 b
64.8 a
0.0 b
45.2 c
51.9 d
61.1 e
57.6 f
65.7 g
63.4 a
0.0 b
43.8 c
50.3 d
59.8 e
56.4 f
63.9 g
69.1 a
0.0 b
45.8 c
54.1 d
64.1 e
60.4 f
64.5 g
  56.7 a
0.0 b
37.2 c
42.7 d
52.7 e
50.0 f
60.2 g
63.5 a
0.0 b
42.8 c
50.3 d
59.2 e
55.4 f
67.0 g
60.5 a
0.0 b
55.2 e
61.8 g
NC
NC
NC
NC
NC
 
MP2=FULL NC NC
NC
NC
NC
NC
NC
NC
NC
NC
65.3 a
0.0 b
42.5 c
51.1 d
60.1 e
56.3 f
62.9 g
65.4 a
0.0 b
43.2 c
51.4 d
60.6 e
56.8 f
63.0 g
57.5 a
0.0 b
37.1 c
43.0 d
53.1 e
50.4 f
57.0 g
65.8 a
0.0 b
46.0 c
62.1 e
58.6 f
65.2 g
64.5 a
0.0 b
44.6 c
51.1 d
60.8 e
57.4 f
63.3 g
NC     NC
NC
NC
NC
NC
NC
     
MP3         60.6 a
0.0 b
40.1 c
48.4 d
55.7 e
51.2 f
67.2 g
                       
MP3=FULL         60.9 a
0.0 b
40.5 c
48.8 d
56.3 e
51.8 f
66.9 g
 
0.0 b
35.7 c
41.3 d
49.9 e
46.3 f
61.9 g
                   
MP4   NC     NC                        
B2PLYP         54.2 a
0.0 b
30.7 c
41.1 d
47.1 e
43.3 f
66.5 g
               
0.0 b
21.7 c
30.9 d
37.0 e
33.4 f
61.1 g
     
B2PLYP=FULLultrafine        
NC
NC
NC
NC
                       
Configuration interaction CID   NC
NC
NC NC 63.7 a
0.0 b
43.5 c
51.7 d
58.3 e
54.1 f
68.9 g
                       
CISD   NC
NC
NC NC 63.0 a
0.0 b
42.8 c
51.0 d
57.6 e
53.5 f
69.0 g
    NC                  
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Quadratic configuration interaction QCISD   49.5 a
0.0 b
35.2 c
39.1 d
48.6 e
45.8 f
98.6 g
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
      NC
NC
       
Coupled Cluster CCD   NC
NC
NC
NC
NC
NC
58.4 a
0.0 b
38.8 c
46.7 d
53.8 e
49.6 f
67.4 g
NC
NC
NC
NC
NC
NC
NC       NC
NC
       
CCSD(T)         NC                        
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) 6-311+G(3df,2p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z

Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD
hartree fock HF 53.6 a
0.0 b
38.3 c
43.4 d
49.1 e
45.2 f
88.6 g
64.4 a
0.0 b
51.6 c
55.6 d
61.1 e
56.7 f
80.8 g
47.6 a
0.0 b
29.9 c
35.9 d
41.6 e
38.7 f
85.7 g
50.4 a
0.0 b
35.5 c
40.3 d
45.6 e
42.6 f
76.0 g
44.0 a
0.0 b
25.3 c
31.3 d
37.2 e
34.7 f
86.4 g
44.6 a
0.0 b
25.8 c
31.8 d
37.8 e
35.3 f
86.6 g
density functional B1B95 75.6 a
0.0 b
51.5 c
63.3 d
67.4 e
63.1 f
78.5 g
84.8 a
0.0 b
61.8 c
72.6 d
77.3 e
72.7 f
70.3 g
       
B3LYP 54.3 a
0.0 b
33.1 c
41.9 d
47.0 e
43.2 f
81.5 g
62.2 a
0.0 b
41.6 c
49.9 d
55.3 e
51.2 f
74.0 g
46.2 a
0.0 b
23.1 c
32.6 d
37.8 e
34.7 f
78.8 g
49.8 a
0.0 b
27.8 c
36.7 d
41.8 e
38.7 f
70.8 g
45.5 a
0.0 b
18.9 c
29.0 d
35.2 e
32.6 f
77.2 g
45.6 a
0.0 b
19.0 c
29.1 d
35.2 e
32.7 f
77.2 g
Moller Plesset perturbation MP2 51.7 a
0.0 b
30.5 c
35.8 d
48.6 e
43.9 f
74.5 g
78.6 a
0.0 b
58.6 c
64.1 d
75.5 e
70.5 f
69.5 g
42.3 a
0.0 b
21.1 c
25.7 d
39.4 e
35.4 f
64.6 a
0.0 b
44.8 c
49.6 d
61.6 e
58.6 f
63.0 g
40.1 a
0.0 b
19.7 c
23.9 d
36.2 e
34.3 f
72.2 g
40.3 a
0.0 b
19.7 c
23.8 d
36.3 e
34.4 f
72.1 g

Single point energy calculations (select basis sets)
cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ cc-pV(T+d)Z
Moller Plesset perturbation MP2FC// HF/6-31G*
0.0 b
45.3 c
52.6 d
61.8 e
57.4 f
67.4 g

0.0 b
39.2 c
46.7 d
157.1 e
127.4 f
61.7 g
   
0.0 b
39.2 c
46.7 d
157.1 e
127.4 f
61.7 g
MP2FC// B3LYP/6-31G*
0.0 b
43.9 c
51.2 d
59.9 e
55.5 f
66.8 g
       
MP2FC// MP2FC/6-31G*    
0.0 b
40.9 c
45.7 d
57.5 e
53.3 f
65.8 g
59.7 a
0.0 b
37.6 c
44.7 d
54.4 e
51.0 f
63.0 g
 
MP4// HF/6-31G*
0.0 b
40.3 c
47.0 d
54.9 e
50.3 f
71.3 g
       
Coupled Cluster CCSD// HF/6-31G*
0.0 b
39.4 c
45.8 d
53.6 e
48.9 f
71.3 g
       
CCSD(T)// HF/6-31G*
0.0 b
37.6 c
44.3 d
52.7 e
48.1 f
70.8 g
       
CCSD// MP2FC/6-31G*       51.9 a
0.0 b
34.1 c
40.3 d
48.4 e
44.6 f
68.0 g
 
CCSD(T)// MP2FC/6-31G*       50.6 a
0.0 b
31.6 c
38.0 d
46.7 e
43.0 f
67.2 g
 
NC = not calculated
For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.
gaw refers to the group additivity method implemeted in the NIST Chemistry Webbook.

See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.