Fine and Hyperfine Structure in14N+2: TheB2Σ+u–X2Σ+g(0, 0) Band

First Measurement of the Weak (0, 4) Band in the B2Σ+u–X2Σ+g System of 14N+2 by Collinear Fast-Ion-Beam Laser Spectroscopy

“…The present rotational constant (B) value is in good agreement with the value of Scholl et al (3), which was obtained from the analysis of the (0, 1) band also by CFIBLS technique, but it is slightly smaller than the more recent value of the same group (6), which was obtained from the analysis of the (0, 0) band. The present spin-rotation constant (␥) value agrees with that of Scholl et al (3), but again it is slightly smaller than the recent value of the same group (6). The agreement between the recent three CFIBLS results for the centrifugal distortion constant (D) (present work, Ref.…”

“…Particularly, in the works of Refs. (3)(4)(5)(6), the spectral resolution has been greatly improved by implementing collinear fast-ion-beam laser spectroscopy (CFIBLS).…”

The and states of N2+: hyperfine and nuclear quadrupole coupling constants, electric quadrupole moments, and electron-spin g-factors. A theoretical study

“…A survey of the experimental literature shows that the observed magnetic hyperfine coupling constants (hfccÕs) are internally consistent (i.e., the resulting spindensity is close to one) for X but not for B. Scholl et al [11] found A iso ðX ; 0Þ ¼ 102:4 MHz and A dip ðX ; 0Þ ¼ 23:3 MHz; both constants increase slightly between v ¼ 0 and v ¼ 2 [12,13]. (Here, MðN ; nÞ represents property M for the nth vibrational level of state N.) An electron spin resonance (ESR) study [14] on 14 N þ 2 (X) could only report isotropic values since free rotation of N þ 2 in the matrix made its full characterization impossible (A iso ðX ; 0Þ ¼ 104:1 MHz and hgi iso ¼ 2:0004).…”

“…For the excited state, experimental values A iso ðB; 0Þ % 700 MHz and A dip ðB; 0Þ ¼ 26 MHz [11,15,16] correspond to about 0:8s þ 0:8p, the total of which much exceeds 100%. Since the 1r u ðs-sÞ SOMO is mainly of stype, A iso ðBÞ is reasonable but A dip ðBÞ contradicts the MO description.…”

“…(Here, MðN ; nÞ represents property M for the nth vibrational level of state N.) An electron spin resonance (ESR) study [14] on 14 N þ 2 (X) could only report isotropic values since free rotation of N þ 2 in the matrix made its full characterization impossible (A iso ðX ; 0Þ ¼ 104:1 MHz and hgi iso ¼ 2:0004). As shown in the literature [11][12][13][14], these hfccÕs give a total s-contribution of about 10%, in line with a singly occupied MO (SOMO) of type 2r g ðp r -p r Þ.…”