Table A.2: Wavelengths and Einstein coefficients (Aij) for 16OH and 18OH averaged over hyperfine structure. The 16OH wavelengths are from Brown et al. (1982) and Varberg & Evenson (1993) and the Einstein coefficients were calculated from the line strengths of Brown et al. (1982). The 18OH wavelengths are from Morino et al. (1995) with Einstein coefficients calculated from the line strengths of Comben et al. (1986).
Transition Wavelength Aij
  ($\mu $m) (s-1)
16OH
J=3/2-3/2a 53.2615 0.04559
  53.3512 0.04481
J=1/2-3/2a 79.1176 0.03575
  79.1812 0.03545
18OH
J=5/2-3/2 119.9651 0.1364
  120.1718 0.1357
$\textstyle \parbox{5.5cm}{ $^{a}$\space Cross ladder transition: $^{2}\Pi_{1/2}$ --$^{2}\Pi_{3/2}$ . }$


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Article Contents
1 Introduction
2 Observations and data reduction
3 Results
4 Modelling of OH in the line of sight
5 16OH/18OH ratio
6 Comparison with other species
7 Summary
Appendix A: Observations and wavelengths
References
List of tables
List of figures