Temperatures of Tesla discharges from OH A → X intensity measurements

The tesla discharge as a spectroscopic source for the study of excimer laser transitions

“…To determine the relationship between wall temperature and internal molecular temperature of emitting species in the discharge, we previously studied rotational intensity distributions in the OH A ~X system. 4 The results confirmed that the measured wall temperature is a meaningful indicator of internal temperature provided the decay time of the excited electronic state is long compared to vibrational and rotational relaxation times.…”

“…Taking R I = R2 = 0.98 for the mirror reflectances and 1= 10 cm, we obtain a threshold concentration N* = 2.7 x 101:l/cm:l. If the discharge is confined to a I-mm-diam capillary of length 10 cm, the active volume becomes V = 0.078 cm:l. The required number of excited molecules is then 2.1 x 10 12 , and the corresponding spontaneous emission rate is AN*V = I x 1020/s, (4) corresponding to a power of 90 W at 2220 A. This figure is within striking distance of the peak power observed for KrCI.…”

TheA(3Π1) State of ClF

“…ϭ 3. Good information on levels above v ϭ 9 of the A state will be needed to determine whether the perturbation in B (8) involves A (11) or one of the two weakly bound ⍀ ϭ 1 states that correlate with two ground-state halogen atoms.…”

“…The fit parameters given in Table 5 are statistically consistent with assignment of the perturber as A (11), and in fact, the D v and H v values were set to test this assignment. On the other hand, the fitted B v and ⌬E are very highly correlated, so that if one is fixed, the other is determined with good precision.…”

“…High-pressure Tesla discharges of halogens in inert buffer gases are characterized by near-Boltzmann distributions of emitting levels and states at temperatures not much above ambient (11,12). Accordingly, while the DЈ 3 AЈ system dominates the emission, 2 other electronic transitions are readily observed when they are spectrally removed from DЈ 3 AЈ (13,14).…”