51G 
DR. WALTER NOEL HARTLEY ON THE ABSORPTION SPECTRA 
Table XYII. — Similar Groups of Absorption Bands which occur in the Vapour 
Spectra of Benzene, Toluene, Ethylbenzene, and the three Isomeric Xylenes. 
Benzene and Toluene are compared at ordinary temperatures, and also at 30° C. 
below their respective boiling-points, at atmospheric pressures. 
Abbreviations:—s., strong; £, feeble; n., narrow; b., broad; v.s., very strong. 
S 
P 
\ 
s 
\ 
\ 
\\ 
A 
Benzene. 
Toluene. 
Benzene, 
12° * 7 C. 
10° C. 
50° C. 
A. 
A. 
A. 
26 ?A 
% 
39 f. 
36 f. 
34 f. 
31 f. 
12 
08 
06' 
051 
03 J S - 
2597 
95 
90 s. 
72 f. 
43 n. 
42 
40 ^ s ' 
33 
29 
s.b. 
2474 7 i 
71 J s ' b ' 
2679 7 f 
75 / L 
73; 
70 >a ‘ 
41 
38 
36 
34 
10 
07 
06 
05 
s. 
s. 
2596 7 
94 J s ‘ 
91 7 
89 J s - 
72 f. 
44 
42 
33 
32 I s - 
2474 7 
72 h 
2690 
88 
80 
78 
75 
72 
70 
40 
37 
36 
34 
31 
11 
08 
07 
02 
00 7 
2597 J ! 
97 
91 
69 f. 
67 f. 
51 f. 
97 
09 f. 
95 f. 
49 f. 
Toluene. 
80° C. 
A. 
2690 
88 
84 
78 
75 
72 
70 
51 
45 
41 
40 
37 
33 
31 
08 
05 
05 
04 
2595 
93 
90 
88 
71 
68 
53 • 
46 
41 
} 
f. 
f. 
f. 
s. 
s. 
f.b. 
f.b. 
s. 
s. 
f. 
s. 
s. 
s. 
s. 
f. 
f. 
f. 
Ethyl¬ 
benzene. 
20° C. 
A. 
2670 7 
67 ; s - 
41 
39 
37 
35 
09 
07 
06 
05 
2597 7 • 
94 j v.s. 
93 
86 
b. 
!}■ 
> 
45 
43 
40 
38 
32 
2476 7 
73 h 
oXylene. 
20° C. 
A. 
2642 7 
39 J 1 ' 
36 f. 
12 
09 
08 
05 
2597 
94 
91 
86 
71 
69 
h 
45 
42 
S} 
m-Xylene. 
11° C. 
A. 
2644 7 
42/ 
09 n. 
06 n. 
2597 7 
95/ 
s. 
44 
43 
}„ 
34 
3 
i} 
s. 
B-Xylene. 
10° C. 
A. 
2688 
78 
70 
js.l 
S} 
33 
30 
06 
02 
2597 
A 
i-b. 
88 J 
33/ 
32 > 
