http://publicationslist.org/data/c.pfrang/atom.xml Christian Pfranghttp://publicationslist.org/c.pfrang$basepathfavicon.icoRecent additions to Christian Pfrang's PublicationsList.org pagehttp://publicationslist.org/publications.png2008-10-11T12:30:59Z http://publicationslist.org/c.pfrang/refid2 2008-10-11T11:26:50Z

The results of an experimental study into the oxidative degradation of proxies for atmospheric aerosol are presented. We demonstrate that the laser Raman tweezers method can be used successfully to obtain uptake coeffcients for gaseous oxidants on individual aqueous and organic droplets, whilst the size and composition of the droplets is simultaneously followed. A laser tweezers system was used to...<br/><br/>King MD, Thompson KC, Ward AD, Pfrang C, Hughes BR (2008) <i>FARADAY DISCUSSIONS </i> 137: 173-192<br/>

http://publicationslist.org/c.pfrang/refid1 2008-10-11T11:19:23Z

Experimental difficulties sometimes force modellers to use predicted rate coefficients for reactions of oxygenated volatile organic compounds (oVOCs). We examine here methods for making the predictions for reactions of atmospheric initiators of oxidation, NO3, OH, O-3 and O(P-3), with unsaturated alcohols and ethers. Logarithmic correlations are found between measured rate coefficients and calcula...<br/><br/>Pfrang C., King M. D., Braeckevelt M., Canosa-Mas C. E., Wayne R. P. (2008) <i>Atmospheric Environment</i> 42: 13 3018-3034<br/>

http://publicationslist.org/c.pfrang/refid4 2008-10-11T11:31:01Z

Gas-phase rate coefficients for the atmospherically important reactions of NO3, OH and O-3 are predicted for 55 alpha,beta-unsaturated esters and ketones. The rate coefficients were calculated using a correlation described previously [Pfrang, C., King, M.D., C. E. Canosa-Mas, C.E., Wayne, R.P., 2006. Atmospheric Environment 40, 1170-1179]. These rate coefficients were used to extend structure-acti...<br/><br/>Pfrang C, King MD, Canosa-Mas CE, Flugge M, Wayne RP (2007) <i>Atmospheric Environment</i> 41: 8 1792-1802 <br/>

http://publicationslist.org/c.pfrang/refid3 2008-10-11T11:24:43Z

The night-time tropospheric chemistry of two stress-induced volatile organic compounds (VOCs), (Z)-pent-2-en-1-ol and pent-1-en-3-ol, has been studied at room temperature. Rate coefficients for reactions of the nitrate radical (NO3) with these pentenols were measured using the discharge-flow technique. Because of the relatively low volatility of these compounds, we employed off-axis continuous-wav...<br/><br/>Pfrang C, Romero MTB, Cabanas B, Canosa-Mas CE, Villanueva F, Wayne RP (2007) <i>Atmospheric Environment</i> 41: 8 1652-1662 <br/>

http://publicationslist.org/c.pfrang/refid6 2008-10-11T11:39:39Z

Methods are developed for predicting rate coefficients for reactions of initiators of tropospheric oxidation with unsaturated compounds that are abundant in the atmosphere; prognostic tools of this kind are essential for atmospheric chemists and modellers. To pursue the aim of exploring such tools, the kinetics of reactions of NO3, OH and O-3 with a series of alkenes are examined for correlations ...<br/><br/>Pfrang C, King MD, Canosa-Mas CE, Wayne RP (2006) <i>Atmospheric Environment</i> 40: 6 1170-1179 <br/>

http://publicationslist.org/c.pfrang/refid5 2008-10-11T11:34:41Z

We present updated structure-activity relations (SARs) for the prediction of rate coefficients for gas-phase reactions with alkenes of the major atmospheric oxidants NO3, OH and O-3. Such SARs provide one way of incorporating essential information about reactivity into atmospheric models. Rate coefficients obtained from correlations relating the logarithms of the rate coefficients to the energies ...<br/><br/>Pfrang C, King MD, Canosa-Mas CE, Wayne RP (2006) <i>Atmospheric Environment</i> 40: 6 1180-1186 <br/>

http://publicationslist.org/c.pfrang/refid7 2008-10-11T11:43:16Z

Rate coefficients for reactions of nitrate radicals (NO3) with the anthropogenic emissions 2-methylpent-2-ene, (Z)-3-methylpent-2-ene.. ethyl vinyl ether, and the stress-induced plant emission ethyl vinyl ketone (pent-1-en-3-one) were determined to be (9.3 +/- 1.1) x 10(-12), (9.3 +/- 3.2) x 10(-12), (1.7 +/- 1.3) x 10(-12) and (9.4 + 2.7) x 10(-17) cm(3) molecule(-1) s(-1). We performed kinetic e...<br/><br/>Pfrang C, Tooze C, Nalty A, Canosa-Mas CE, Wayne RP (2006) <i>Atmospheric Environment</i> 40: 4 786-792 <br/>

http://publicationslist.org/c.pfrang/refid8 2008-10-11T11:46:59Z

The kinetics of the reactions of the atoms O(P-3), S(P-3), Se(P-3), and Te((3)p) with a series of alkenes are examined for correlations relating the logarithms of the rate coefficients to the energies of the highest occupied molecular orbitals (HOMOs) of the alkenes. These correlations may be employed to predict rate coefficients from the calculated HOMO energy of any other alkene of interest. The...<br/><br/>Pfrang C, King MD, Canosa-Mas CE, Wayne RP (2006) <i>INTERNATIONAL JOURNAL OF CHEMICAL KINETICS</i> 38: 5 351-356 <br/>

http://publicationslist.org/c.pfrang/refid11 2008-10-11T12:00:26Z

The night-time atmospheric chemistry of the biogenic volatile organic compounds (Z)-hex-4-en-1-ol, (Z)-hex-3-en-1-ol ('leaf alcohol'), (E)-hex-3-en-1-ol, (Z)-hex-2-en-1-ol and (E)-hex-2-en-1-ol, has been studied at room temperature. Rate coefficients for reactions of the nitrate radical (NO3) with these stress-induced plant emissions were measured using the discharge-flow technique. We employed of...<br/><br/>Pfrang C, Martin RS, Canosa-Mas CE, Wayne RP (2006) <i>PHYSICAL CHEMISTRY CHEMICAL PHYSICS </i> 8: 3 354-363 <br/>

http://publicationslist.org/c.pfrang/refid9 2008-10-11T11:51:45Z

A discharge-flow system, coupled to cavity-enhanced absorption spectroscopy (CEAS) detection systems for NO3 at lambda = 662 nm and NO2 at lambda = 404 nm, was used to investigate the kinetics of the reactions of NO3 with eight peroxy radicals at P similar to 5 Torr and T similar to 295 K. Values of the rate constants obtained were (k/10(-12) cm(3) molecule(-1) s(-1)): CH3O2 (1.1 +/- 0.5), C2H5O2 ...<br/><br/>Vaughan S, Canosa-Mas CE, Pfrang C, Shallcross DE, Watson L, Wayne RP (2006) <i>PHYSICAL CHEMISTRY CHEMICAL PHYSICS </i> 8: 32 3749-3760 <br/>

http://publicationslist.org/c.pfrang/refid12 2008-10-11T12:28:56Z

Rate coefficients for reactions of nitrate radicals (NO3) with (Z)-pent-2-ene, (E)-pent-2-ene, (Z)-hex-2-ene, (E)-hex-2-ene, (Z)-hex-3-ene, (E)-hex-3-ene and (E)-3-methylpent-2-ene were determined to be (6.55 +/- 0.78) x 10(-13) cm(3) molecule(-1) s(-1), (3.78 +/- 0.45) x 10(-13) cm(3) molecule(-1) s(-1), (5.30 +/- 0.73) x 10(-13) cm(3) molecule(-1) s(-1), (3.83 +/- 0.47) x 10(-13) cm(3) molecule(...<br/><br/>Pfrang C, Martin RS, Nalty A, Waring R, Canosa-Mas CE, Wayne RP (2005) <i>PHYSICAL CHEMISTRY CHEMICAL PHYSICS</i> 7: 12 2506-2512<br/>

http://publicationslist.org/c.pfrang/refid10 2008-10-11T11:56:04Z

The Group on Earth Observations System of Systems, GEOSS, is a co-ordinated initiative by many nations to address the needs for earth-system information expressed by the 2002 World Summit on Sustainable Development. We discuss the role of earth-system modelling and data assimilation in transforming earth-system observations into the predictive and status-assessment products required by GEOSS, acro...<br/><br/>Hollingsworth A, Uppala S, Klinker E, Burridge D, Vitart F, Onvlee J, De Vries JW, De Roo A, Pfrang C (2005) <i>QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY </i> 131: 613 3493-3512 <br/>

http://publicationslist.org/c.pfrang/refid13 2008-10-11T12:17:38Z

We present an application of cavity-enhanced absorption spectroscopy with an off-axis alignment of the cavity formed by two spherical mirrors and with time integration of the cavity-output intensity for detection of nitrogen dioxide (NO2) and iodine monoxide (IO) radicals using a violet laser diode at lambda = 404.278 nm. A noise-equivalent (1sigma = root-mean-square variation of the signal) fract...<br/><br/>Kasyutich VL, Bale CSE, Canosa-Mas CE, Pfrang C, Vaughan S, Wayne RP (2003) <i>APPLIED PHYSICS B-LASERS AND OPTICS</i> 76: 6 691-697<br/>

http://publicationslist.org/c.pfrang/refid14 2008-10-11T12:21:04Z

We present an application of continuous-wave (cw) cavity-enhanced absorption spectroscopy (CEAS) with off-axis alignment geometry of the cavity and with time integration of the cavity output intensity for detection of narrow-band and broadband absorbers using single-mode red diode lasers at lambda = 687.1 nm and lambda = 662 nm, respectively. Off-axis cw CEAS was applied to kinetic studies of the ...<br/><br/>Kasyutich VL, Canosa-Mas CE, Pfrang C, Vaughan S, Wayne RP (2002) <i>APPLIED PHYSICS B-LASERS AND OPTICS </i> 75: 6-7 755-761<br/>