A medium resolution mid-infrared FT-IR instrument (IBM Instruments IR 44) has been modified to do step scanning; this has been done with the use of concepts previously applied to both near- and far-infrared instruments. In this paper we illustrate the method used for driving the mirror in the step scan mode and present some preliminary results from using the instrument with photothermal detection. At the current state of development, results obtained with the use of phase modulation indicate that this method produces significantly higher signal-to-noise ratios than does the use of amplitude (chopper) modulation to generate the photothermal signal.
ChildersJ. W. and PalmerR. A., Am. Lab.18 (3), 22 (1986).
4.
MartinM. A.ChildersJ. W., and PalmerR. A., Appl. Spectrosc.41, 120 (1987).
5.
LowM. J. D.LacroixM., and MorterraC., Spectrosc. Lett.15, 57 (1982); (b) LowM. J. D. and MorterraC., Appl. Spectrosc.41, 280 (1987).
6.
PalmerR. A. and SmithM. J., Can. J. Phys.64, 1086 (1986).
7.
PeoplesM. E.SmithM. J., and PalmerR. A., Appl. Spectrosc.41, 1257 (1987).
8.
TengY. C. and RoyceB. S. H., Appl. Opt.21, 77 (1982).
9.
DébarreD.BoccaraA. C., and FournierD., Appl. Opt.20, 4281 (1981).
10.
DébarreD., Thèse, Docteur 3eme Cycle, Université de Paris-sud, Centre d'Orsay (1981).
11.
ChamberlainJ., Infrared Phys.11, 25 (1971); (b) ChamberlainJ. and GebbieH. A., Infrared Phys.11, 57 (1971).
12.
ChamberlainJ. W., Principles of Interferometric Spectroscopy (John Wiley & Sons, New York, 1979).
13.
LloydL.RisemanS. M.BurnhamR. K.EyringE. M., and FarrowM. M., Rev. Sci. Instrum.51, 1488 (1980).
14.
ConnesJ. and ConnesP., J. Opt. Soc. Am.56, 896 (1966).
15.
RichardsP. L., J. Opt. Soc. Am.54, 1474 (1964).
16.
RosencwaigA. and GershoA., J. Appl. Phys.47, 64 (1976).
17.
RoarkJ. C.PalmerR. A., and HutchisonJ. S., Chem. Phys. Lett.60, 112 (1978).
18.
ChoquetM.RoussetG., and BertrandL., Can. J. Phys.64, 1081 (1986).
19.
McGovernS. J.RoyceB. S. H.BenzigerJ. B., J. Appl. Phys.57, 1710 (1985).
20.
RoyceB. S. H., Plenary Lecture WP1, 5th International Topical Meeting on Photoacoustic and Photothermal Phenomena, Heidelberg, F.R.G. (1987).
21.
GoldenW. G.SapersteinD. D.SeversonM. W., and OverendJ., J. Phys. Chem.88, 572 (1984).
22.
NafieL. A. and VidrineD. W., in Fourier Transform Infrared Spectroscopy, FerraroJ. R. and BasileL. J., Eds. (Academic Press, New York, 1982), Vol. 3, pp. 83–123.
23.
ManningC. J.SmithM. J.PalmerR. A., and ChaoJ. L., unpublished results.
24.
RosenthalR. J., 14th Annual Meeting of the Federation of Analytical Chemistry and Spectroscopy Societies (1987), Paper 451.
25.
GrimW. M.IIIGrahamJ. A.HammakerR. M., and FateleyW. G., Am. Lab.16 (3), 22 (1984).
