Table 7. Energy Values (eV), Quantum Defects (δ), and Assignments of the Rydberg Series Converging to Ionic Electronic Ground (16a′)⁻¹X̃²A′, and First (15a′)⁻¹Ã²A′ Excited States of C₂H₅NO₂^a,^b.

(IE1)v = 11.08 eV (16a′)−1			(IE2)v = 11.51 eV (15a′)−1
En	δ	assignment	En	δ	assignment
(ns ← 16a′)			(ns ← 15a′)
7.54(2)(s,w)	1.04	3s	8.26(6)(b)	0.95	3s
9.54(5)(b)	1.02	4s	10.05(6)(s)	0.94	4s
10.22(1)(s)	1.02	5s	10.65(2)(s,w)	1.02	5s
10.53(8)(s,w)	0.99	6s
10.77(1)(s)	0.93	7s
(np ← 16a′)			(np ← 15a′)
8.52(1)(s,w)	0.69	3p	8.86(9)(s,w)	0.73	3p
9.82(4)(s,w)	0.71	4p	10.22(1)(s)	0.75	4p
10.34(1)(s,w)/10.38(0)(s)	0.71/0.59	5p	10.77(1)(s)	0.71	5p
10.59(7)(w)	0.69	6p
(nd ← 16a′)			(nd ← 15a′)
9.48(3)(w)	0.08	3d	9.79(7)(s,w)	0.18	3d
10.20(0)(s)	0.07	4d	10.60(6)(b,w)	0.12	4d
10.52(1)(s,w)	0.07	5d
10.71(1)(s,w)	–0.07	6d

^a(s) shoulder structure; (w) weak feature; (b) broad structure (the last decimal of the energy value is given in parentheses for these less-resolved features).

^bSee text for details.