Two techniques are presented for measuring the refractive index of fluids. The first is a reflective technique where liquid is applied to a rough surface to hold the liquid during measurement. Ellipsometric psi and delta data are acquired and analyzed to determine the fluid refractive index. The second technique is refractive and uses a hollow prism cell to contain the liquid. The fluid index is then determined using the prism minimum deviation technique. Both techniques have been applied over a very wide spectral range from the vacuum ultraviolet to the infrared and have been implemented on a research spectroscopic ellipsometer system (VUV-VASE®) with continuously variable angle of incidence. The refractive index of several candidate immersion fluids for 157 and 193 nm immersion lithography are reported over the spectral range from 156 to 1700 nm in a nitrogen-purged environment. The advantages and disadvantages of both techniques are discussed. Results were checked against values measured on very accurate prism minimum deviation equipment at NIST, and agreement with NIST has been found to be good on all fluids measured.
Using a naturalistic design involving consecutive referrals self–selected for family–oriented treatment, forty–two participants from a residential programme and twenty–five participants from a community–based programme were assessed on a range of alcohol–use and psychosocial measures before treatment. A proportion of these cases were assessed after treatment and at six months’follow–up. At six months’ follow–up 79 per cent of both the residential and community groups were either abstinent or drinking moderately. However, more members of the residential group (75 per cent) were abstinent at follow–up compared with the community group (36 per cent). In contrast, more members of the community group were moderate drinkers (43 per cent) at follow–up compared with the residential group (4 per cent). At six months’ follow–up, compared with the community group, more members of the residential group showed a clinically significant reduction in recent negative consequences of drinking and psychological adjustment problems. Both groups made significant mean gains on indices of alcohol abuse and psychosocial adjustment but there were important intergroup differences. The residential group showed a greater mean reduction in recent negative consequences from drinking but the community group showed a greater mean reduction in the percentage of days’ heavy drinking.
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