Ultraviolet and visible complex refractive indices of secondary organic material produced by photooxidation of the aromatic compounds toluene and <i>m</i>-xylene

Liu, P. F.; Abdelmalki, N.; Hung, H.-M.; Wang, Y.; Brune, W. H.; Martin, S. T.

doi:https://doi.org/10.5194/acp-15-1435-2015

Articles | Volume 15, issue 3

https://doi.org/10.5194/acp-15-1435-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-15-1435-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 15, issue 3

Research article

|

10 Feb 2015

Research article |

| 10 Feb 2015

Ultraviolet and visible complex refractive indices of secondary organic material produced by photooxidation of the aromatic compounds toluene and m-xylene

P. F. Liu, N. Abdelmalki, H.-M. Hung, Y. Wang, W. H. Brune, and S. T. Martin

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Final revised paper (published on 10 Feb 2015)
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Preprint (discussion started on 08 Aug 2014)
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Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC C6508: 'Review of Liu et al.', Anonymous Referee #1, 03 Sep 2014
RC C6637: 'Referee comment', Anonymous Referee #2, 08 Sep 2014
RC C7918: 'Review', Anonymous Referee #3, 13 Oct 2014
AC C9429: 'Response to reviews', Pengfei Liu, 23 Nov 2014

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Pengfei Liu on behalf of the Authors (23 Nov 2014) Author's response Manuscript

ED: Referee Nomination & Report Request started (24 Nov 2014) by Alexander Laskin

RR by Anonymous Referee #3 (16 Dec 2014)

Suggestions for revision or reasons for rejection

In response to comment 20 we accept the authors’ explanation of the use of Sun’s (2007) equation for calculation the imaginary part of the complex refractive index. But it should be emphasized that a significant assumption in made. The calculation assumes that the absorption spectrum measured for diluted solutions can be linearly extrapolated to extremely high solution concentration. This implies that no intramolecular interactions occur in the dry material that affects light absorption and may not play a role in the diluted solution phase. In addition, it is assumed that and no chromophores structure changes occur for example due to pH differences in different solution concentrations or environments. This should be clarified.

Also In response to comment 20 the authors referred the reader to figure S1. From the “response to reviewer” : “Another piece of evidence is that the k values calculated from Eq. 1 are not systemically higher than those derived from ellipsometry, as shown in Fig. S1, indicating that Eq. 1 does not overestimate k.” Figure S1 has only UV-Vis derived k and not ellipsometry data. Please show explicitly in the graph the ellipsometry derived data.

In response to comment 29 regarding the density values assumed in k calculation of SRFA the authors write: “The k values for Suwannee river fulvic acid were also derived with Eq 1. Information about material density is added in the revised manuscript”. The addition to the manuscript is: Page 20590 Line 17
A material density of (1.4 ± 0.1) × 103 kg m-3 was used in the analysis for toluene- and m-xylene-derived SOMs (Ng et al., 2007). For Suwannee river fulvic acid, a material density of (1.47 ± 0.02) × 103 kg m-3 was used (Dinar et al., 2006).

Based on communication with IHSS there are differences in the density of the "Reference Humic and Fulvic Acids" (1.5 gr cm-3) and the “Standard Humic and Fulvic Acids” (1.1 and 1.3 gr cm-3). This could lead to 10-33% overestimation of k. Please clarify which sample of SRFA you used and amend accordingly.

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ED: Reconsider after minor revisions (Editor review) (16 Dec 2014) by Alexander Laskin

AR by Pengfei Liu on behalf of the Authors (24 Dec 2014) Author's response Manuscript

ED: Publish as is (11 Jan 2015) by Alexander Laskin

AR by Pengfei Liu on behalf of the Authors (13 Jan 2015)

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