510 
DR. WALTER NOEL HARTLEY ON THE ABSORPTION SPECTRA 
Table X.—Absorption Bands in the Spectrum of Ethylbenzene Vapour at Different 
Temperatures and Constant Pressure. 
Abbreviations:—s., strong ; b., broad; £, feeble or faint; v.s., very strong. 
(Photographic Plate 5a, 31.5.06.) 
Corresponding groups of bands are indicated m the different spectra by the same 
Greek letters. 
16°-5 C. 
X. 
\ 
P 
\ 
New 
\ 
7 I 
New ( 
26731 
72/ 
70 
67 
41 
39 
37 
35 
33 
3 
31 
28 
09 
07 
06 
05 
03 
s. 
s. 
Iff 
s. 
New 
\ 01J 
25971 
>v.s. 
94 J 
931 , 
\ 86 / D - 
N S} 
11 } * 
45 1 
43 J s< 
401 
38 J s - 
351 
\ 32 J 3 - 
e \ 24761 
\ 73 J Sl 
20 1 
18 / 
2379 n. 
19 bands 
40° C. 
X. 
2681 1 
f. 
78 J 
a ! 
75 1 
S 67 J 
s.b. 
57 1 
43 J 
f.b. 
P ] 
40 1 
\ 39 ] 
f. 
36 
f. 
€ 
30 
OO T 
f. 
j-i y 
\ 25 J 
7 
06 
f. 
c 
02 
f. 
2596 
f. 
s 
N 72 1 
P 
64 
62 1 
K 
59 
56 1 
K 
51 _ 
46 ' 
P- 
43 
V 
40 
f. 
S 35 
f. 
2480 
f. 
6 
| 76 ' 
1 
N 73 
f 
22 
f. 
20 
19 
2379-5’ 
n. 
18 bands 
70° C. 
X. 
P 
2681 
77 
73 
, 67 
52 
45 
42 
}, 
}s. 
X 
X 
34 
33' f. 
29 f. 
2420 f. 
2379 n. 
8 bands 
100° C. 
X. 
27161 
13 J s ’ 
101 
\ 06 J s - 
2 bands 
Note. —In the above spectra there is an intense general absorption between A.A 2678 and 2329; the 
powerful line, Cd 18, A 2573 being cpiite blotted out. The absorption increases in intensity with rise 
in temperature, until at 100° C. all but two bands have disappeared. 
A distinguishing feature in this spectrum is the appearance of four new bands: XX 2632-33 s., 
2628-31 s., 2601-03 s., and 2582-84. They do not occur in the spectra of either benzene or toluene. 
