4A06!"#$%&'()*+,-./012$34(56*789:;<=>?@ABCDAEFGHI, JGKL, MGNO, PQIR, STUVWXYZB[\(]^,, +,, -+_`,ab<cda./efg, hij./<./kl, !
"klemnop6*. h<qr!"kl], ./0se!"tuvw(<xop6*klyfg, z/{e|}h~()gm(ue7,aej%&'6*)q(a*.

h<%!"#$&'~. d], +,<!"kl]<%?630 nmE&'t, !"\<+,-./e01(z/2$6*h~(t, h<&'U +,<M¡¢%<£¤(¥¦tu.1)
h<+,<!"kl], 3§(cda¨©ªy%&'«¬­e¤®¯i°ue, ±²Y³y,´µde¤®tu¶·¸¹ 40-100 atm y]º»¼½»¾e¿À6*. Áhy´µ], ÂÃÄ<·Å¸¹ (0.04 ~ 100 atm) y+,<%&'«¬­¤®tu. Æ.Ç(f%&'#$6*!"kle+,Èl~ÉÊË(f*~Ì®tu9:; Quasi-Equilibrium Model?QE 9:‡;EÍ, ÁhyÎÏÐÑÒ~tÓjiuÉÊË®Ô? K P !"#$%&'()*+,‡. ! O :O !/, 01234/56789, :2;'<=>/?@9A.
22

WÕÖZ+,<!"kl<%&'«¬­]×Ø(Ù¯uÚ, 0 ~ 1 atm <Û·¸¹y],¶Ü

a&'Ýyf* Cavity Ring-down .%ÝyÕÖOau. h<ÕÖÞÝ]ßàáâÑ<ãä(-å<¶æçèÏÑéêt, Á<wyëÑìÑ%mæ¯í*h~yî%ïðgñ6òÝyf*. hi()gó;î 1.06 m y 10 km ôÑõÑ<Õö%ïî÷u. %ø] Nd:YAG
ëÑìÑ2$<ù,ëÑìÑÓ, 615 ~ 650 nm <%áâÑú(ûütu. ¶æçèÏÑj<ýi%<%z/þÿy¤®t, <1w!_ô"#$%Ñ&y­'tu.

ýi%<()<ÈU*Ô5Ôy<+,j, -¾õ.Ò/01Úu. ßàáâÑ\<+,·Å!_¯í, Ái2i<%<345¤t, 67<8j5'tu Rayleigh 9:()*34;t<nh~y, ß<%&'=1Úu.
>u, ¶·¸¹(?] 100 atm >y@A÷*î¯ 1 m <¶·ó;Ó, B 40 ~ 100 atm <·Å¸¹(?*+,<%&'=<¤®Ou.
WCD~EFZFig. 1 (], 0 ~ 0.3 atm <·Å¸¹¨©y 630 nm <+,<%&'=¤®tuCDGtu. HI]+,<%&'=, JI]+,<K·jL­Mu./ÔNyf*.

! " (1)

Light absorption # ! O nO2molecule ) ~qCDe÷jiu.
678 2, 3)y], 1 ?)S 55atm Tª<·Å¨©y, Ái2i 7.55 ?
-465-2)S 7.1 (10 Ucm Umolecule ) yfg, ¤®·<¸¹e¶Vb«*º»¼½»¾'! O # 8.1 % 10 $462)*+$'!+,-"
&Û·!
!

"

#$%&%
n+++++7+&!
O2+-4:;9<:;3+9-8'++++Fig.1(Û·¸¹y<78Q(1)<¡YZ[#'+-2#+ 1 Ú u ~ h R , 8.1 (10-46 cm

OP<78Q (1) ()./01*+)23456*/4,+7+&!8'9-8&25++(./01*+)23456*/4,+7+&!8%9-8&

OP<78Q?1E(O+,<!"#$&'<%&'«¬­ !O

22"&

¶·!
!

&""&
n+++++7+&!
O2+-4:;9<:;3+9-8'+++++,!"#$&'<./ÔNWoX

2+

hi>y¤®¯ia 100 atm

1.0¸¹>y¡Y6*~, Ij(ÕÖ8j¡i*. h<uÚ, +,<%&'=

1O *
20.5

ab(L­M*uÚ<9:;Íu (Fig.2 cd). !"#$&'$h6~630~630 nm
nm

e(Æ.Ç(f*+,./<fg& O‡ :O2 2(O2:O2) ~!"#$&'$h¯a~1260~1260 nm
nm

1200

0.01400

1300

Wavelength /nm

K3಴

È./ (O2) w(ÉÊËÌ®t, ÉÊ

3O :3O
22

Ë®Ô~É!"kl<%&'«¬­NIR Emission Int.

1O *:1O *22¬­eÙ¯na*\]eIj~au. ¯j(, Fig.1 ^_(G6`g !O 8

3O + 3 O
22Fig.2 +,<%&'~¢%$kÑ0!Ô~t, HIÈhî¯ig<%&'=, JI+,<·Å~tu~°<5Ôûn~, Tª< (2) jS (3) Qeûi*.
‡‡Light absorption # ! OnO:O:O
222(2)2! "2,")‡nO# '' 4 P - K P‡ $ 8 K P‡ . P - K P‡ **:O2 28(+l l l l(3)‡h<~°,nO

2 : O 2 ]!"kl~t%&'t*+,./<./ÔN,P (atm) ]K·,‡K P‡ (atm) ]+,<Èl~!"kl<w<ÉÊË®Ô, ! O2:O2 (cm2Umolecule-1) ]É!"kl<%&'«¬­, /]m 298 (K) <~°<./ÔN~·Å!n6*oÔyf*. (2) Qyº»¼½»¾tuCD Fig.3 (G6. HI]+,<%&'=, JI]+,<K·<pqyf*.
´µ<ÕÖy÷jiuCD<º»¼½»¾Z[~OP<78ÞÝ()*678rst*.
OP<78ÝÛ·¸¹yº»¼½»¾t, ¶·¸¹(¡Y6*~ttnÕÖ:ÑÒj¡i‡‡*<(ut, K ] 350 (atm) , ! O :O ] 7.9v0.1 (10-24Ucm2Umolecule-1) Óu OE 9:;yP22], 0.4 ~ 90 atm <Â·ÅÃÄy<!"#$%&'wIy°*h~eIj(au.
1) E. Furui et al., Chem. Phys. Lett., 471, 45 (2009)2) G. D. Greenblatt et al., J. Geophys. Res., 95, 18577 (1990)a)b)+!K$!K#!K"

Û·!K!
!K!!

+>1/3+?45@+ABCDEFG+>1/3+?45@+AHIDEFG+++++++J5;;,2:)**+;*+):K+A5;LK+"G+M)<3+),N+O2)913+A5;LK+'G++++(#'++>1/3+?45@+ABCDEFG+>1/3+?45@+AHIDEFG+++++++J5;;,2:)**+;*+):K+A5;LK+"G++M)<3+),N+O2)913+A5;LK+'G++++./01*+)23456*/4,+7+&!8'+9-8&++++!K%+./01*+)23456*/4,+7+&!8P+9-8&++++

3) H. Naus and W. Ubachs, Appl. Opt., 38, 3423 (1999)"&¶·!

!K!("= +7+)*-!K&!
"!

"!!!

#!!!

$!!!

="+7+)*-"

Fig.3 a) Û·¸¹~ b) ¶·¸¹(?*+,%&'=<·ÅWoX%!!!