Table 1.

Molecules, dilution factors, T values, and N_loc values

Molecule	σ	T	Nloc	Molecule	σ	T	Nloc
Methane	1	—	0.005	Cyclopentene	0.003	0.89	5.7
Ethylene oxide	0.5	0.015	0.16		0.008	0.70	5.0–5.1
	0.7	0.018	0.12		0.01	0.35	3.1–4.5
	0.8	0.01	0.10		0.01	0.67	2.9
Cyclopropane	0.7	0.0035	2.4		0.02	0.4	2.3–3.9
	0.3	0.0174	1.3	2,3-Dihydrofuran	0.5	0.2	5.3
Ethane	1	0.01	1.1	Tetrahydrofuran	0.01	0.75	2.2–4.0
	0.8	0.02	2.9	Cyclopentanone	0.003	1.3	2.6–5.5
Oxetane	1	0.13	1.84	Norbornene	0.01	1.6	6.8–12
	1	0.18	0.22		0.1	2.6	10
	1	0.22	0.29	Cyclopentane	0.01	1.7	6.1–9.0
	1	0.22	0.14		0.02	1.4	6.2
Methyl formate	0.3	0.05	1.67		0.09	0.5	3.2–5.2
Propylene oxide	0.02	0.5	2.4	Cyclohexane	0.005	1.3	8.1–12
	0.02	0.6	1.8		0.01	2.2	9.4
Fluorobenzene	1	0.9	2.2–3.7		0.01	1.1	—
Cyclobutanone	0.4	0.24	1.3–3.2	Isobutane	0.05	0.2	3.8
	0.3	0.4	1.5	2-Methyltetrahydrofuran	0.003	1.2	11–13
Propane	0.2	0.08	3.5		0.004	1.5	13
	0.4	0.26	0.4–1.1

From the data of Stewart and McDonald (11), modes other than C—H stretches and results where σ had only an upper bound were excluded. The mean value of the N_loc is about an order of magnitude larger than T; the correlation between the two is shown in Fig. 1. Where Stewart and McDonald listed a group of bands under one frequency, ranges are given for N_loc indicating the minimum and maximum values obtained numerically for the bands near that frequency.