Isoprene 300ppb on B-Caryo SOA Seed

VOC/NOx 1

04.07.2008

Lights on at 09:50Short DMA is out of service

1 HALO

1.5 HALO

1.5 HALO

1.5 HALO

12:20 (2.5 HALO) lights off

During filter flushing

DMPS averaged of filling and lights on (mode has not changed)

~ 1 HALO (isoprene)

~ 1 HALO (isoprene)

High mz 30

There could be a bit of nucleationcpc number is stable and not decreasing anymore

1.75 HALO (nucleation is happening)

2.5 HALO (old mode increased from 217 to 250nm, new mode appeared)

Nucleation + wall losses(mass is not changing much)

3 HALOnucleation stopped at about 2 HALO!

3.3 HALO

Number is flat!Nucleation – wall loss = ZERO!

16:53 Lights off

Too long stopped it at 19:13