Optical measurement of the evaporation of sulfuric acid droplets

C. B. Richardson; R. L. Hightower; A. L. Pigg

doi:10.1364/AO.25.001226

Applied Optics
Vol. 25,
Issue 7,
pp. 1226-1229
(1986)
•https://doi.org/10.1364/AO.25.001226

Optical measurement of the evaporation of sulfuric acid droplets

C. B. Richardson, R. L. Hightower, and A. L. Pigg

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C. B. Richardson, R. L. Hightower, and A. L. Pigg, "Optical measurement of the evaporation of sulfuric acid droplets," Appl. Opt. 25, 1226-1229 (1986)

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Abstract

Single micron-size sulfuric acid droplets are levitated in vacuum in a quadrupole trap through which passes the beam from a He–Ne laser. Scattered light is monitored by a fixed detector as cavity resonances are excited in the evaporating droplet. Mie-Debye theory is used to determine particle size, which, with kinetic theory, yields vapor pressure. Over the temperature range studied, −10 to +30°C, the vapor pressure of pure sulfuric acid is lnp(Torr) = (20.70 ± 1.74) − (9360 ± 499)/T(K).

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Particle	T(°C)	a(μm)	b(μm/s) ×10⁴	c(μm/s²) ×10⁸	d(μm/s³)	dr/dt (Å/s)	Lifetime (s)	p(Torr)
1	−10.0	5.176	− 0.642	− 0.0796	2.202 × 10⁻¹⁴	0.738	34,000	3.81 × 10⁻⁷
2	0.1	4.352	− 1.935	− 0.6067	2.829 × 10⁻¹³	2.368	7200	1.25 × 10⁻⁶
3	0.2	4.381	− 2.300	− 0.2404	3.318 × 10⁻¹³	2.358	7200	1.25 × 10⁻⁶
4	5.8	3.373	− 3.753	− 0.1156	−2.335 × 10⁻¹²	4.798	3700	2.59 × 10⁻⁶
5	10.9	3.882	− 7.672	− 7.976	2.252 × 10⁻¹¹	10.49	2670	5.81 × 10⁻⁶
6	19.9	3.139	−12.85	− 37.58	2.866 × 10⁻¹⁰	14.49	930	8.21 × 10⁻⁶
7	19.9	3.893	−15.91	− 18.38	−4.574 × 10⁻¹¹	20.96	1035	1.21 × 10⁻⁵
8	19.8	3.669	−19.89	110.9	−1.147 × 10⁻⁹	24.80	810	1.45 × 10⁻⁵
9	19.8	3.442	−15.38	− 10.35	−1.509 × 10⁻¹⁰	24.08	1176	1.41 × 10⁻⁵
10	29.9	2.948	−51.11	891.0	−3.810 × 10⁻⁸	97.29	294	6.89 × 10⁻⁵
11	29.9	3.139	−45.46	−239.7	4.818 × 10⁻⁹	49.44	334	3.10 × 10⁻⁵
12	29.9	3.287	−45.74	− 64.48	−1.086 × 10⁻⁹	52.40	296	3.31 × 10⁻⁵

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Applied Optics