Atmospheric homogeneous nucleation of H<sub>2</sub>SO<sub>4</sub> and H<sub>2</sub>O
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![Fig. 2a. [H 2 SO 4 ] measured by two CIMSs at the beginning of the nucleation reactor](https://thumb-eu.123doks.com/thumbv2/123dok_br/18194296.332689/18.918.172.541.117.483/fig-a-h-measured-cimss-beginning-nucleation-reactor.webp)
![Fig. 2b. The measured WLF with two CIMSs located at the beginning (initial [H 2 SO 4 ]) and end of the nucleation reactor (residual [H 2 SO 4 ]) as a function of initial [H 2 SO 4 ]](https://thumb-eu.123doks.com/thumbv2/123dok_br/18194296.332689/19.918.166.544.106.484/measured-located-beginning-initial-nucleation-residual-function-initial.webp)
![Fig. 3. The measured nucleation rates and [H 2 SO 4 ] when SO 2 and UV were introduced to the reactor](https://thumb-eu.123doks.com/thumbv2/123dok_br/18194296.332689/20.918.165.542.143.467/fig-measured-nucleation-rates-h-uv-introduced-reactor.webp)
![Fig. 4a. The measured Log J vs. Log [H 2 SO 4 ] for H 2 SO 4 -H 2 O BHN at di ff erent RH and residence times using two di ff erent nucleation reactors (12.8 cm ID 5.08 cm ID)](https://thumb-eu.123doks.com/thumbv2/123dok_br/18194296.332689/21.918.168.544.80.469/measured-erent-residence-times-using-erent-nucleation-reactors.webp)
![Fig. 4b. The measured Log J vs. Log RH at di ff erent [H 2 SO 4 ] (3 × 10 6 – 7 × 10 6 cm − 3 )](https://thumb-eu.123doks.com/thumbv2/123dok_br/18194296.332689/22.918.163.547.94.492/fig-measured-log-j-vs-log-rh-erent.webp)
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