I 60

performance-proved instruments for INFRARED SPECTROSCOPY

4000

keel I path 0.10 mm

3500 3000 2500 2000 1800 1600 1400 FREQUENCY (CM"1)

I I 1 1 π . 1

1200 1000 800 600 400 200 22-minute scan of m-fluorotoluene shows wide range of Model 621. Final band is of 2>2 cm"1.

NEW MODEL 621IR SPECTROPHOTOMETER PROVIDES OPTIMUM ENERGY TRANSFER OVER ENTIRE 4000-200 CM RANGE In the Mode l 621 F i l ter -Grat ing* Infrared Spectrophotometer, Perkin-Elmer — w o r l d leader in infrared —has achieved a new level of performance over the instrument's tota l operat ing range: f rom 4000 to 200 cm"1. Fundamental to this add i t iona l per­

formance is greater ut i l izat ion o f ava i iab fe energy, even where low energy is classi­cal ly a prob lem.To do this,Perkin-Elmer has

• w idened the slit opening capabi l i ty t o opt imize performance under low energy condit ions;

• enlarged the size of the Nernst g iower source for greater total energy;

• ut i l ized aspheric ( toroidal , parabo lo ida l ) optics for most efficient transfer of energy, and precise imagery—a Perkin-Elmer exclu­sive feature;

• redesigned the thermocouple detector target for greater sensitivity over the to ta l range;

• mainta ined Perkin-Elmer's unique, fast

f / 4 . 5 opt ica l system, w i th short paths fo r eff icient and rap id purg ing. These features prov ide an energy bonus and increase the opt ical precision of the Mode l 621's system. Thus, they enhance a t rad i t ional Perkin-Elmer advantage: the unique capaci ty to perform microanalysis to an unequal led degree of sensitivity. N o matter whether the sample is l imi ted, or the component of quant i tat ive interest is present only as the f ract ional part of a microgram, Perkin-Elmer's tota l system is geared to provide a quick, easy and pre­cise determinat ion. For more informat ion, including sample spectra, wr i te to Perkin-Elmer C o r p o r a t i o n , 707 M a i n Avenue,, No rwa lk , Connecticut.

*U. S. Pat. No. 3,144,498

perkin elmer