Milestones of the “group Migeotte” lab. _______________________ 1950 M. Migeotte first measurements at the Jungfraujoch 1956 International Geophysical Year 1958 Installation of the large prism-grating spectrometer 1963 Double pass on the grating 1965 new way to compute Fourier transforms : FFT is known 1965 Installation of double pass at Kitt Peak solar spectrometer 1966 First digital computer – DDP New Telescope 1969 First Balloon Flight – 27 flights (until 1993) 1970 ASPEN Meeting on Fourier Spectroscopy 1973 Installation of a stepping FTS at the coude focus 1977 Atlas with J. Brault and L. Testermann 1978 Modification of that home-made instrument into a fast scanning one 1984 First high resolution FTS spectra, high S/N ratio 1989 We become the “Alpine Station” within the NDSC, for FTIR 1989 We dismantle the grating Spectrometer 1990 Installation of the BRUKER 120 HR 1990 Farewell of our DDP 224.

1950 F irst measurements

Methane Columbus, grating Jungfraujoch, grating Jungfraujoch, FTS

Citation MM

International Geophysical Year Installation of the large prism- grating spectrometer Double pass on the grating

Inside the spectrometer : the grating

1956 M. Migeotte, L. Neven and J.W. Swensson : The Solar Spectrum from 2.8 to 23.7 microns. Analog data. + table of Measures and Identifications (1957) L. Delbouille, G. Roland : The Solar Spectrum from 7498 to Å + table of Measures and Identifications J.W. Swensson, W.S. Benedict, L. Delbouille, G. Roland (1970). Analog data L. Delbouille, L. Neven, G. Roland : Photometric Atlas of the Solar Spectrum from 3000 to 10,000 Å. Digital data. **1981 L. Delbouille, G. Roland, J.W. Brault and L. Testermann : Photometric Atlas of the Solar Spectrum from 1,850 to 10,000 cm -1 **1994 C.B. Farmer, L. Delbouille, G. Roland and Ch. Servais : The Solar Spectrum between 16 and 40 microns. ** recorded with Fourier Transform Spectrometers, digital data. Atlases

(1965) (1969) (1971) (1972) (1977) (2001)

1965 Installation of double pass at Kitt Peak 1966 First digital computer – DDP New telescope

Freons and Ozone 1974 Publications of Molina and Rowland, Stolansky and Cicerone first identification of HF absorption in balloon spectra confirmation of the possibility to observe it from the Jungfraujoch. The observations for the solar “visible” Atlas being complete, the spectrometer is equipped with a grating for longer wavelengths. The “atmospheric” measurements now have priority.

HF line recorded with the grating spectrometer

Freon 12 from 1951 to 1986

NDSC – NDACC sites

Molecules identified in high-resolution solar infrared spectra H 2 O, CO 2, CH 4, N 2 O, CO, O 3, NO, NO 2, HNO 3, HNO 4, CFCl 3, CF 2 Cl 2, CHF 2 Cl, CH 3 Cl, CCl 4, CF 4, HCl, HF, ClONO 2, COF 2, SF 6, C 2 H 2, C 2 H 6, C 2 H 4, OCS, HCN, H 2 CO 2, H 2 CO, CH 3 OH, N 2 … Many isotopic forms of H 2 O, CH 4, O 3, HCl…

Bruker IFS 120 HR in 1990