Emission Band Spectra of Nitrogen the Lyman-Birge-Hopfield System

Abstract

The near ultraviolet part of the emission spectrum of nitrogen has been photographed under high resolution. Thirteen bands of the [Formula: see text] system (Lyman–Birge–Hopfield) have been analyzed and new vibrational and rotational constants obtained. Combining the observed data with those obtained by Stoicheff from the Raman spectrum of nitrogen, refined equilibrium constants for the ground state were obtained. The predissociation in the α1Πg state was observed.

The rotational and rotation‐vibrational Raman spectra of 14N2, 14N15N and 15N2

“…The constant B,-B, has not yet been measured in Raman which prevents a determination of the equilibrium distance re from pure Raman data. In ultraviolet 14N2 has been measured by Lofthus [3], Wilkinson [4], and Vanderslice et al [5]. In Table X a comparison is given between the results obtained by these authors and those obtained in this work for the 14N2 molecule.…”

“…Inserting y = -4.6 x l o w 5 cm-' as determined by Lofthus [3] and neglecting that y is different for the isotopic molecules, a is obtained for each molecule. The results given in Table VIII for a have been obtained using B,-B, from both the constrained and the unconstrained analysis.…”

Effects of N2 addition on density and temperature of radicals in 60MHz capacitively coupled c-C4F8 gas plasma

“…The condition is a pressure of 10 Pa, a gas flow rate of Ar/ C 4 F 8 = 1000/ 6 SCCM, and a 60 MHz power of 1200 W. The calculated spectra were made on the measured spectra of the ͑0-1͒ and ͑1-2͒ bands between 2075 and 2088 Å. Fitting of measured spectra with calculated spectra was done by least squares approximation using parameters of the spectrum width, the rotational temperature, and the band intensities of the ͑0-1͒ and ͑1-2͒ bands. Though some peaks around 208.5 nm were reported, 19,20 the peaks seemed to be weak. Figure 7 shows the emission spectra of Ar/ C 4 F 8 /N 2 plasma and Ar/ N 2 plasma in the condition of a pressure of 10 Pa, a 60 MHz power of 1200 W, and gas flow rates of Ar/ C 4 F 8 /N 2 = 900/ 6 / 100 SCCM and Ar/ N 2 = 900/ 100 SCCM, respectively.…”

Evidence for predissociation of N2 a 1Πg(v≥7) by direct coupling to the A′ 5Σ+g state

“…As a result, the KER calculated from Eq. (2). is smaller than the actual kinetic energy release E according to…”

“…Therefore the highest resolution K.ER spectra, such as presented here, are obtained by retaining only fragmentation processes in which the atoms are ejected perpendicular to the beam direction, i.e., with 1 tl"..; 2 ns, thus minimizing the contribution of t to the calculation of KER in Eq. (2). For molecules dissociating immediately upon electron capture, the KER resolution is approximately 2.2 me V at KER = 100 me V.…”