By Gary M. Hieftje (Eds.)

content material: Selective excitation of probe ion luminescence (SEPIL) / John C. Wright, Frederick J. Gustafson, and Laura C. Porter --
purposes of tunable-diode-laser IR spectroscopy to chemical research / J.F. Butler, K.W. Nill, A.W. Mantz, and R.S. Eng --
Two-photon excited molecular fluorescence / M.J. Wirth and F.E. Lytle --
Laser-excited luminescence spectrometry / J.D. Winefordner --
Laser fluorimetry : detection of aflatoxin B₁ in infected corn / G.J. Diebold and R.N. Zare --
Laser-enhanced ionization for hint steel research in flames / J.C. Travis, G.C. Turk, and R.B. eco-friendly --
The learn of organic surfaces by way of laser electrophoretic gentle scattering / B.R. Ware --
New laser-based tools for the size of brief chemical occasions / Gary M. Hieftje, J. Michael Ramsey, and Gilbert R. Haugen --
Laser functions in photoelectrochemistry / S.P. Perone, J.H. Richardson, B.S. Shepard, J. Rosenthal, J.E. Harrar, and S.M. George --
Coherent anti-Stokes Raman scattering spectroscopy / Bruce S. Hudson --
Spectroscopy via inverse Raman scattering / Edward S. Yeung --
Time-resolved resonance Raman spectroscopy (TR³) and similar vidicon Raman spectrography : vibrational spectra in nanoseconds / William H. Woodruff and Stuart Farquharson.

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Example text

The e m i s s i o n i n ­ t e n s i t y i n t h i s case i s p r o p o r t i o n a l t o c o n c e n t r a t i o n . At h i g h o p t i c a l d e n s i t i e s , t h e amount o f r a d i a t i o n e x c i t i n g t h e f l u o r o p h o r i s r e d u c e d by t h e r a t i o o f i t s a b s o r b a n c e t o t h e t o t a l s o l u t i o n value. The r e s u l t i n g i n n e r f i l t e r e f f e c t a l t e r s t h e i n c i d e n t i n ­ t e n s i t y a t d i f f e r e n t d i s t a n c e s a l o n g t h e c e l l p a t h l e n g t h .

3. wiRTH AND LYTLE Two-Photon Excited Molecular Fluorescence 45 a s h o r t p a t h l e n g t h , h o w e v e r , t h i s e m i s s i o n was s t i l l d i m i n i s h e d a t h i g h s a m p l e a b s o r b a n c e s due t o t h e r e a b s o r p t i o n p r o c e s s . The d i s t a n c e t h r o u g h w h i c h t h e f l u o r e s c e n c e t r a v e l e d was s u f f i c i e n t l y l a r g e t o r e s u l t i n q u a n t i t a t i o n e r r o r s . I n t h e two-photon case, the i n t e n s i t y remains constant, independent o f t h e i n t e r f e r e n c e c o n c e n t r a t i o n up t o s o l u t i o n a b s o r b a n c e s o f 3.

The t w o - p h o t o n e x c i t a t i o n s p e c t r u m o f n a p h t h a l e n e s e r v e s t o d e m o n s t r a t e t h e c o n c e p t s d i s c u s s e d above. As a n e x a m p l e , t h e p a r t i a l e n e r g y l e v e l d i a g r a m o f F i g u r e 5 c a n be u s e d t o p r e d i c t d i f f e r e n c e s b a s e d on p a r i t y . The o n e - p h o t o n s p e c ­ t r u m s h o u l d h a v e two bands c o r r e s p o n d i n g t o t h e A -> B ^ t r a n s ­ i t i o n s , w h i l e t h e t w o - p h o t o n s p e c t r u m s h o u l d have one b a n d c o r r e s ­ ponding t o the A •> Β transition.

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