1. HBD-CF4Transmittance (The case of the Anomalous O2 Spikes) HBD Meeting 1/5/2010 B.Azmoun, S.Stoll Brookhaven National Lab

2. PPM History since 12/3/09 No Spikes, just ppm’s getting lower as expected Spikes Appear, and with inc. freq. H2O O2 2

3. O2 Spikes do not Correlate with HBD Diff. Press. (cause unknown, but we have theories….) 3

4. Zoom In …(Still no correlation observed) 4

5. Compare moment spikes occur to Trans. Scan Results 12/31/09 Scan of HBD-CF4 Time of Scan Note: Three Scans are done in succession:1 st : Input, 2 nd : West, 3 rd : East 5

6. 01/01/10 Scan of HBD-CF4 Note: Analyzer values are recorded at beginning of scan 6

7. 01/03/10 Scan of HBD-CF4 It seems elevated analyzer values have little effect on Trans. Results! Note: Last scan is done at about the same time a spike appears! 7

8. 01/04/10 Scan of HBD-CF4 It seems elevated analyzer values have little effect on Trans. Results! Note: 2nd scan is done at about the same time a spike appears! 8