Fulcher band

Fig. 6.11. The Fulcher-band system of D2 observed in front of a gas inlet. The first lines of each Q-branch of the visible diagonal transitions are marked ( 91181-86)...

Fig. 6.13. Calculations of D/XB for the Fulcher-band from the collisional-radiative model CRMOL. The solid dot is an experimentally obtained value via a calibrated...

H2, D2, HD + + + Bands near carbon walls, limiters divertors identified excitation rates for bands in the visible available, CRM for the Fulcher-band exists other bands may be useful... 

However, photographs were taken which showed qualitatively a strengthening of the Fulcher bands relative to the rest of the secondary spectrum at the higher pressures which favor Finally by taking an exposure of... 

It is not our intention in this paper to attempt a detailed explanation of these results or a discussion of their bearing on those of previous workers. However, we feel that the evidence obtained does lead to the conclusion that conditions of discharge which favor the production of Hz favor the excitation of the Fulcher bands, particularly those in the red. We hope that this bit of evidence may be of service to those working in this field and that we may be able to add more by further experiments. 

R branch of this band were used for analysis although a Boltzmann plot of these lines did yield a straight line, the rotational temperature determined from the slope of this line was independent of the gas kinetic temperature. Thus the Fulcher band is unsuited for use in measuring the gas kinetic temperature. This example illustrates the difficulty of accurate gas kinetic temperature measurement... 

These vibrational constants agree with those obtained by Birge through extrapolation of the upper states of the Fulcher bands and which would read about 0.0210... 

An important task is of course a quantitative determination of the contributing molecular to the atomic flux. This requires the knowledge of the full population of the upper Fulcher-a state (3p 3IIU). In practice it will in most cases not be possible to measure all rotational and vibrational bands with a high resolution spectrometer. Figure 6.11 displays such a spectrum from which a rotational temperature of Trot = 500 K and a vibrational temperature of Tv b = 5000K for the molecular ground-state Is 1X+ was deduced. The procedure to obtain the latter is described in more detail in [47], With these temperatures it is then possible to add lines, which could not be directly measured. 

In order to convert the photons into molecular fluxes the D/XB-value for the Fulcher-a band is needed. For this purpose a collisional-radiative model (CRM) has been set up which includes all levels that could contribute to the population of the 3p 3f7u state. Figure 6.12 shows that under the conditions of the TEXTOR scrape-off layer the levels 2p 3flu and 2s 3X+ also contribute to... 

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