@article{sahoo_zelenak_narayanaswamy_2020, title={Pressure scaling of the collisional broadening parameters of Kr 4p(6)S(0)(1) ->-> 5p [3/2](2) transition}, volume={59}, ISSN={["2155-3165"]}, url={https://doi.org/10.1364/AO.394932}, DOI={10.1364/AO.394932}, abstractNote={Pressure scaling of collisional broadening parameters of krypton
					(absorber) 
      
	4
	
	  
	    p
	    6
	  
	
	
	  S
	  0
	  1
	
	→→
	5
	p
	
	  [
	  3
	  
	    /
	  
	  2
	  
	    ]
	    2
	  
	
      
     transition centered at 107.3 nm in
					the presence of nitrogen 
      
	
	  
	    
	      N
	    
	    2
	  
	
      
     (perturber) is investigated. The
					absorption spectrum in the vicinity of the transition is obtained from
					the two-photon excitation scan of krypton in the presence of the
					perturber at different prescribed pressures varying from a few torrs
					to 10 atm. The absorption spectra reveal noticeable asymmetry at
					atmospheric pressure, and the asymmetry becomes increasingly
					pronounced with pressure; however, the absorption spectra at
					sub-atmospheric pressures tested are symmetric. The absorption spectra
					are fitted with synthetic asymmetric Voigt profiles across all
					pressures, wherein the asymmetry parameter is varied to capture the
					asymmetry at different pressures. The collisional
					shift (
      
	
	  
	    δ
	    C
	  
	
      
    ), the symmetric equivalent
					collisional full width at half maximum (
      
	
	  
	    w
	    
	      C
	      ,
	      0
	    
	  
	
      
    ), and the asymmetry parameter (
      
	a
      
    ) are determined from the synthetic
					fits at various pressures. All the parameters are observed to vary
					linearly with pressure over the entire range of the pressure values
					tested. The mechanisms that cause the asymmetry in the absorption
					spectra are also discussed.}, number={26}, journal={APPLIED OPTICS}, publisher={The Optical Society}, author={Sahoo, Abinash and Zelenak, Dominic and Narayanaswamy, Venkateswaran}, year={2020}, month={Sep}, pages={7760–7769} }
 @article{zelenak_narayanaswamy_2019, title={Demonstration of a two-line Kr PLIF thermometry technique for gaseous combustion applications}, volume={44}, ISSN={["1539-4794"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85059987939&partnerID=MN8TOARS}, DOI={10.1364/OL.44.000367}, abstractNote={Experiments were performed to demonstrate a dual-wavelength excitation krypton planar laser-induced fluorescence (Kr PLIF)-based 2D temperature imaging technique in a laminar non-sooting CH4/N2 diffusion flame. The technique exploits the thermochemical dependence of the overlap integral arising from Kr absorption and excitation laser spectra to yield the temperature without the need to know the local mixture composition. The choice of the two excitation wavelengths is made using the knowledge of the fuel mixture and pressure. The two excitation wavelengths lie within the same 4p6S01→→5p[32]2 transition, and their selection is informed such that the resulting Kr PLIF signal ratio depends primarily on the temperature and negligibly on local composition. Mean temperature fields show excellent agreement when compared to Fluent simulations across different regions of the combustion domain, while the single-shot temperature field exhibits slightly degraded accuracy. Overall, the technique provides very similar figures of merit compared to conventional composition-dependent thermometry approaches and showcases a promising scope for application in complex reacting flows.}, number={2}, journal={OPTICS LETTERS}, author={Zelenak, Dominic and Narayanaswamy, Venkateswaran}, year={2019}, month={Jan}, pages={367–370} }
 @article{zelenak_narayanaswamy_2017, title={Composition-independent mean temperature measurements in laminar diffusion flames using spectral lineshape information}, volume={58}, ISSN={["1432-1114"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85029953501&partnerID=MN8TOARS}, DOI={10.1007/s00348-017-2430-y}, number={10}, journal={EXPERIMENTS IN FLUIDS}, author={Zelenak, D. and Narayanaswamy, V.}, year={2017}, month={Oct} }
 @article{zelenak_sealy_narayanaswamy_2016, title={Collisional broadening of Kr (4p(6) S-0(1) -> -> 5p [3/2](2)) transition with combustion species as collision partners}, volume={174}, journal={Journal of Quantitative Spectroscopy & Radiative Transfer}, author={Zelenak, D. and Sealy, W. and Narayanaswamy, V.}, year={2016}, pages={28–38} }