Table 6. Energy Values (eV), Quantum Defects (δ), and Assignments of the Rydberg Series Converging to Ionic Electronic Ground (13a′)⁻¹X̅²A^′, and First (12a′)⁻¹A^~2A′ Excited States of CH₃NO₂^a Compared with Previous Work^b.

(IE1)ad = 11.07 eV (13a′)−1				(IE2)ad = 11.73 eV (12a′)−1
En	δ	assignment	En3	En	δ	assignment	En3
(ns ← 13a′)				(ns ← 12a′)
7.637	1.01	3s	7.531	8.38(3)(s)	0.98	3s	8.257
9.552	1.01	4s	9.541	10.251	0.97	4s	10.247
10.251	0.92	5s	10.170
10.54(3)(b)	0.92	6s	10.493
(np ← 13a′)				(np ← 12a′)
8.420	0.73	3p	8.732	9.08(3)(s)	0.73	3p	9.126
9.77(0)(s)	0.76	4p	9.761	10.445	0.75	4p	10.439
10.315	0.75	5p	10.309
10.583	0.71	6p	10.573
8.803	0.55	3p′	8.792	9.450	0.56	3p′	9.315
9.91(1)(s)	0.57	4p′	9.806	10.583	0.55	4p′	10.493
10.39(3)(w)	0.52	5p′	10.347
10.629	0.45	6p′	10.628
(nd ← 13a′)				(np ← 12a′)
9.379	0.16	3d	9.518	10.01(5)(s)	0.18	3d	10.066
10.14(6)(s)	0.16	4d
10.498	0.12	5d
10.66(5)(s)	0.20	6d

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

^bSee text for details.